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Security & Compliance Glossary

MTTR (Mean Time to Respond / Resolve)

MTTR is a metric that measures the average time it takes to respond to or resolve an incident, from detection to resolution. In security, it captures how quickly a team contains and recovers from an attack; in operations, how fast it restores a failed service. A lower MTTR means faster recovery and less damage.

In practice

MTTR is one of a family of related metrics, alongside mean time to detect (MTTD) and mean time to acknowledge (MTTA). Tracking each separately shows whether your bottleneck is noticing the problem or fixing it.

In a breach, MTTR maps directly to cost: the longer an attacker dwells, the more data is exposed and the larger the cleanup. Preparation, clear runbooks, and a retainer with a named responder are what actually move the number down.

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Where it comes up

MTTR shows up in two very different conversations: incident response, where it measures how quickly you contain and resolve, and vulnerability management, where it measures how quickly you remediate against your stated SLA.

For compliance the number matters less than the consistency. An auditor comparing your policy to your evidence cares whether you met the timeframe you committed to, not whether the timeframe is impressive.

MTTR (Mean Time to Respond / Resolve): common questions

What is a good MTTR?

There is no universal figure. What matters is that it is measured, that it matches what your policy commits to, and that the trend is visible.

Is MTTR mean time to respond or to resolve?

Both are used, which is why the metric is frequently ambiguous. Define which one you mean in your own policy and stay consistent, because an auditor will compare the definition to the evidence.