MDR vs MSSP vs SIEM: Key Differences, SLAs, and How to Choose
Technical review by Volodymyr Garbar, CISO & Tech Lead
Updated: 11 August 2026
An 8×5 SOC has analysts handling alerts during an eight-hour business day, five days a week. A 24/7 SOC keeps staffed triage and defined response available at every hour, including nights, weekends, and holidays. The deciding factor is how long the organization can safely wait for human judgment and action when a serious alert arrives outside staffed hours.
Security tools can collect logs and generate alerts around the clock under either model. That does not make both models equivalent. The practical difference appears at 2 a.m.: who sees the alert, who investigates it, who is called, and who is allowed to contain the threat?
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Run the SOC & Incident Readiness TestWhat is the difference between an 8×5 and a 24/7 SOC?
The difference is continuous human coverage. An 8×5 SOC performs routine triage and investigation during business hours, often with an on-call path for critical events. A 24/7 SOC maintains staffed triage and investigation at all times. Containment is continuous only when analysts have preapproved authority or an after-hours decision-maker is reachable.
| Coverage model | Analyst availability | What happens to a critical alert at 2 a.m. | Common fit | Main risk |
| 8×5 | Business hours | Automation records and routes the alert; routine human review waits, unless on-call criteria apply | Local operations with low after-hours impact and a tested escalation path | Long queue time for events that miss the on-call threshold |
| 8×5 + on-call | Business hours plus callable responder | Critical alerts page an on-call person; lower-severity work waits | Teams that need emergency coverage but cannot staff every hour | Slow acknowledgment or unclear authority during rare incidents |
| Extended hours | Two shifts or coverage aligned to customer activity | Analysts handle events during the extended window; on-call covers the remainder | Regional companies with long operating days | Weekends, holidays, and late-night gaps remain |
| 24/7 co-managed or follow-the-sun | Continuous coverage shared across teams or locations | The active team triages and investigates under a shared case process | Global, regulated, or high-exposure environments | Weak handovers or split ownership can delay action |
| 24/7 internal | Continuous internal shifts | Internal analysts triage and investigate; response follows internal authority | Large or highly specialized environments with sustainable staffing | Cost, night-shift depth, leave coverage, and retention |
Compare internal, hybrid, and managed SOC models when the open question is who should own the operation rather than when analysts should be available.
What do SOC operating hours actually cover?
SOC operating hours describe when people perform security work. They should never be defined by a dashboard being online. Separate the service into five layers before comparing an internal team or provider.
| Layer | What it means | The question to settle |
| Telemetry collection | Logs, endpoint events, cloud activity, identity signals, and network data reach the monitoring platform | Which sources are expected at all hours, and who is alerted when data stops? |
| Alert generation | Rules, analytics, and security products flag behavior that needs review | Which detections run continuously, and how are failed rules or integrations found? |
| Triage | A person validates the alert, adds context, assigns severity, and removes obvious noise | Is triage staffed or merely on-call, and which severity starts the clock? |
| Investigation | An analyst connects evidence across systems, scopes the incident, and determines likely impact | Does overnight coverage include investigation, or does it end after acknowledgment? |
| Containment | Authorized action limits harm, such as isolating an endpoint or disabling an account | Which actions can the SOC take, whose approval is needed, and what happens if the approver does not answer? |
A contract can promise 24/7 collection and alerting while limiting human investigation to business hours. Another can provide continuous investigation but require customer approval for every containment step. Both can be sold as "24/7 monitoring." The operating detail lives in the verbs.
For the technology side of that distinction, compare the 2026 Buyer's Guide to SIEM Deployment Models. SIEM deployment and analyst coverage are connected decisions, but one does not define the other.
What is an 8×5 SOC?
An 8×5 SOC has analysts performing routine monitoring, triage, investigation, and service work during a defined business-hours window. Platforms continue collecting data outside that window. Alerts either wait in a queue or trigger an on-call path according to severity and asset criticality.
The model can be credible when systems have limited after-hours activity, the likely impact grows slowly enough to tolerate delay, critical alerts can page a qualified responder, and logs remain available for the next shift. It is weaker when customer services, privileged access, cloud workloads, remote users, or industrial operations remain active overnight.
What an 8×5 model needs to work
A defined uncovered-hours risk. Document which systems remain active, what can happen before the next shift, and who accepts that residual risk.
A critical-alert path. Route a narrow set of high-confidence events to an on-call responder instead of expecting every alert to wake someone.
Reliable data retention. Preserve the evidence needed to reconstruct events that began overnight.
A morning queue standard. Review high-severity overnight events first, confirm data-source health, and record which alerts exceeded the accepted delay.
Tested escalation. Run at least one after-hours scenario and confirm that contact details, authority, and access work outside office time.
An 8×5 model fails quietly when the team describes after-hours risk as "low" but has never defined the systems, incident types, or maximum delay behind that judgment.
What is a 24/7 SOC?
A 24/7 SOC maintains staffed security triage and investigation every hour of the year. It continuously receives telemetry, validates alerts, builds incident context, and escalates confirmed threats. Response actions are also continuous only when the SOC has authority to act or can reach an authorized customer contact within the required time.
True continuous coverage needs more than a night-shift inbox. Confirm the depth available during the least convenient shift: whether Tier 2 investigation is reachable, how complex cases move to senior responders, and whether overnight analysts can access the same data and tools as the day team.
What to confirm before calling coverage 24/7
Before describing a SOC service as 24/7, confirm which activities are performed continuously by people, not merely by tools, and what responders are authorized to do. Check the following points:
- A person is actively responsible for triage at all times, rather than only reachable by phone.
- The service defines which alerts receive investigation overnight and which wait for the next shift.
- Severity rules use business context and asset criticality, not only a tool score.
- Senior investigation and incident-response support have a documented escalation route.
- Containment actions, approval limits, and fallback rules are agreed before an incident.
- Handover records preserve decisions, evidence, open questions, and next actions between shifts.
- Missing telemetry and failed integrations create service alerts of their own.
- Reports distinguish acknowledgment, triage, investigation, escalation, and containment times.
- Are there SOC models between 8×5 and 24/7?
Yes. Many organizations use an intermediate or mixed model because different assets and incident types have different time tolerances.
What SOC coverage models are available?
SOC coverage is not limited to 8×5 or 24/7. Seven common options are 8×5, on-call, extended-hours, severity-based, co-managed nights and weekends, follow-the-sun, and fully staffed 24/7 coverage. Each model changes who is available after hours and what work they can perform.
| Coverage model | How it works | When it fits | What to verify |
| 8×5 | Analysts work during defined business hours. After-hours alerts normally wait for the next shift. | Organizations with limited off-hours activity and tolerance for delayed investigation. | Covered time zones, holidays, queue ownership, and treatment of critical overnight alerts. |
| 8×5 plus on-call | A business-hours team handles routine work, while critical alerts page an after-hours responder. | A small number of high-impact scenarios require emergency attention. | Escalation thresholds, time to reach a qualified responder, and backup arrangements. |
| Extended-hours coverage | Analysts cover evenings, early mornings, weekends, or other hours beyond the standard workday. | Operations extend beyond one shift but do not require continuous staffing. | Exact hours, time zones, holidays, and responsibility for uncovered periods. |
| Severity-based after-hours coverage | Tools operate continuously, but people investigate after hours only when an alert meets defined severity criteria. | Critical alerts cannot wait, while lower-priority cases can remain queued. | Severity logic, business context, downgrade rules, and treatment of misclassified alerts. |
| Co-managed nights and weekends | The internal team covers business hours, while a provider covers nights, weekends, or selected response activities. | An existing security team needs broader coverage without staffing additional shifts. | Handover rules, shared access, escalation paths, and responsibility boundaries. |
| Follow-the-sun | Regional teams transfer active cases across time zones as each working day ends. | Multinational organizations with security teams in several regions. | Handover quality, regional access restrictions, holiday gaps, and consistent procedures. |
| 24/7 staffed SOC | Qualified analysts continuously triage and investigate alerts. Containment occurs only when authority and access are defined. | Always-on or high-risk environments where delayed investigation could cause serious harm. | Staffing depth, investigation SLAs, senior escalation, containment authority, and service resilience. |
For the managed-service definition, read What Is SOCaaS and How It Works for the service definition, workflow, and retained customer responsibilities.
How much staffing does a 24/7 SOC require?
One continuously filled analyst seat requires 168 coverage hours each week. Dividing that by a 40-hour workweek gives 4.2 full-time equivalents before annual leave, sickness, training, meetings, handovers, and vacancies. A real rota therefore needs more than four people for each seat that must never be empty.
For two concurrent analyst seats plus engineering and leadership, a practical planning model often starts around 10–12 people. The number is not a universal benchmark. Alert volume, shift length, specialist depth, automation quality, response duties, local labor rules, and the acceptable amount of single-person coverage all change it.
In the EU, shift design must also account for the Working Time Directive, including limits on average weekly hours, daily and weekly rest, paid leave, and additional night-work protections.
For full staffing and cost assumptions, use the dedicated comparison: Building a SOC vs. Outsourcing a SOC.
Free guide
What does managed 24/7 SOC coverage cost?
Compare European SOCaaS price ranges, common billing models, and the operational work that different quotes include or leave with your internal team.
Get the SOCaaS pricing guideHow should an organization choose between 8×5 and 24/7 coverage?
Start with the maximum acceptable delay for each critical incident scenario. Then choose the least complex coverage model that can meet that delay with named people, working access, and defined authority. A general risk label is too soft; set a time and test it.
- Which services operate outside business hours? Include customer platforms, identity, cloud administration, remote access, production systems, and third-party connections.
- How quickly can harm spread? Compare the time needed for credential theft, lateral movement, data transfer, encryption, or operational disruption with the next staffed window.
- Which alerts require human judgment? Identify the detections that cannot safely wait and the data an analyst needs to validate them.
- Which actions must happen after hours? Separate notification, investigation, isolation, account disablement, blocking, evidence preservation, and recovery coordination.
- Who has response authority? Name the decision-maker for disruptive actions and define the fallback when that person is unavailable.
- Which reporting or contract clocks apply? Map incident awareness, classification, customer notice, authority reporting, and evidence requirements.
- Can the staffing model survive leave and turnover? Price weekends, holidays, training, sickness, management, senior depth, and handover time.
- What does a realistic exercise reveal? Walk a high-impact incident through the least staffed shift and record every wait, dependency, and missing permission.
Signals that point toward each model
| 8×5 may be sufficient when… | 24/7 or co-managed coverage is more credible when… |
| Critical systems and users are largely inactive overnight | Customer, cloud, identity, production, or OT systems remain active at all hours |
| A defined delay until the next shift stays within risk tolerance | Material harm can grow before the next business window |
| High-severity events have a tested on-call path | Many alert types need immediate human context and investigation |
| Response authority can be reached for rare critical events | Containment decisions must be available within minutes or a fixed SLA |
| The organization has simple geography and limited third-party dependencies | Operations span time zones, suppliers, or critical service chains |
| Contracts and reporting duties allow the documented delay | Customer, sector, or incident-reporting commitments create short clocks |
Do NIS2, ISO 27001, SOC 2, or PCI DSS require a 24/7 SOC?
No listed framework creates a universal rule that every organization must staff a security operations center 24/7. They set risk management, monitoring, incident handling, evidence, or reporting expectations. The organization must choose and justify coverage that can meet the requirements applying to its systems, contracts, sector, and risk.
| Framework | What matters for coverage | What it does not automatically require |
| NIS2 | Article 21 includes incident handling and business continuity. Article 23 sets staged reporting for significant incidents, including an early warning within 24 hours and an incident notification within 72 hours after awareness. | A named 24/7 SOC staffing model. The organization still needs a way to detect, classify, escalate, and report within the applicable clock. |
| ISO/IEC 27001 | A risk-based information security management system, monitoring, incident management, defined responsibilities, and evidence that controls operate. | A fixed analyst schedule for every certified organization. |
| SOC 2 | Controls relevant to the selected Trust Services Criteria and evidence that the described controls are designed and operate as stated. | A continuously staffed Security Operations Center. SOC 2 is an assurance examination, not a staffing standard. |
| PCI DSS v4.0.1 | Daily review of specified audit logs, automated review mechanisms for defined logs, investigation of anomalies, and prompt handling of critical-control failures. | A blanket requirement for analysts to sit in a SOC at every hour. |
Coverage can still become a practical requirement when the accepted response delay, customer contract, critical-service role, or reporting process cannot be met by business-hours review. Write that logic into the risk treatment and test it with the people who must act.
What should a 24/7 SOC SLA specify?
A useful SLA turns "24/7" into observable steps. It should let the customer reconstruct what happened from the first signal to the final handover.
- Staffed function. State whether the service provides continuous alerting, triage, investigation, escalation, incident response, or a defined combination.
- Severity scope. List which severities receive overnight work and how asset criticality changes priority.
- Clock start. Define whether time begins at event creation, platform alert, analyst receipt, validation, or customer notification.
- Measured action. Separate acknowledgment, triage, investigation, escalation, containment, and customer-notification targets.
- Response authority. List actions the SOC can take without approval, actions requiring approval, and the fallback when approval is unavailable.
- Customer dependency. Define the contacts, access, business context, and decisions the customer must supply, plus the effect of a missed response.
- Data health. Set expectations for detecting and reporting missing logs, broken connectors, time drift, and failed detections.
- Senior escalation. State when Tier 2, incident response, forensics, or management becomes available and whether those resources share the same clock.
- Shift handover. Require a case record containing scope, evidence, decisions, open questions, owners, and next actions.
- Evidence and reporting. Specify incident timelines, analyst notes, SLA calculations, exported data, service reports, and exception records.
For a complete provider-evaluation process, read What to Look for in a SOCaaS Provider.
How can an organization move from 8×5 to 24/7 coverage?
- Move in stages. Continuous coverage built without a narrow overnight scope often creates a larger alert queue with a more expensive rota.
- Measure the uncovered window. Review when high-risk systems operate, when priority alerts arrive, and how long they wait for a qualified analyst.
- Define minimum overnight scope. Choose the assets, detections, severities, and response actions that cannot wait until morning.
- Set authority and contacts. Approve after-hours actions, escalation paths, fallback decisions, and customer response expectations.
- Choose the delivery design. Compare internal shifts, follow-the-sun, co-managed coverage, and a managed service against the same scope.
- Pilot the least staffed shift. Run realistic events through nights, weekends, and holidays. Measure waits, handovers, access failures, and missing context.
- Expand from evidence. Add sources, use cases, and response actions only after the existing overnight process is stable and measurable.
Coverage is one part of capability, not a maturity grade. A disciplined 8×5 team with tested on-call response can outperform a nominal 24/7 operation that has weak data, shallow investigation, and unclear authority.
Use the SOC maturity model to assess whether staffing, data, detection, response, measurement, and learning support the target coverage.
Final thoughts: Test the operating model at 2 a.m.
Put one scenario through the design: a privileged account is taken over at 2 a.m. on a public holiday. Who sees the alert? Who checks the identity, endpoint, cloud, and network evidence? Who can disable the account or isolate the device? What happens if the customer contact does not answer?
If the working answer is "the morning team reviews it," the operation is 8×5 regardless of how long the tools stay online. If named people can investigate and take agreed action within a measured time, the organization has real after-hours coverage.
Define the 24/7 coverage your organization actually needs
Q-Sec can map critical assets, after-hours scenarios, escalation, response authority, data sources, retained responsibilities, and SLA requirements before you extend an internal rota or select a managed SOC.
Frequently asked questions
What is a 24/7 SOC?
A 24/7 SOC keeps staffed security triage and investigation available at every hour. Continuous containment depends on agreed authority, working access, and an after-hours customer decision path.
Does 24/7 monitoring mean analysts investigate every alert overnight?
No. It can describe continuous data collection or automated alerting only. Confirm whether people triage, investigate, escalate, and contain events overnight, and which severities receive that work.
Does an 8×5 SOC stop collecting logs after business hours?
Usually not. SIEM, EDR, cloud, and other tools can keep collecting data. The difference is when a person reviews alerts and how critical events reach an on-call responder.
How many analysts are needed for a 24/7 SOC?
One continuously filled seat consumes 168 hours weekly, or 4.2 40-hour FTEs before leave and training. Two seats plus engineering and leadership often start around 10–12 people.
Does NIS2 require a 24/7 SOC?
NIS2 requires risk-based security measures, incident handling, and staged reporting for significant incidents. It does not prescribe a 24/7 SOC, but business-hours coverage must still meet applicable detection and reporting needs.
Can a company outsource only nights and weekends?
Yes. A co-managed SOC can cover selected hours, alert severities, systems, or investigation tasks while the internal team keeps daytime operations and high-impact business decisions.
Is a 24/7 SOC always better than an 8×5 SOC?
No. Continuous coverage is valuable only when data is reliable, analysts can investigate, handovers work, and someone can authorize action. Choose the schedule that meets the documented response delay.
