Mean Time to Repair (MTTR) is a key cybersecurity and IT metric that measures the average time required to identify, resolve, and restore normal operations after a system failure, security breach, or other incident. MTTR includes the entire repair process, from the moment the issue is detected until full service is restored. A lower MTTR indicates faster recovery and greater operational resilience, which is critical for minimizing downtime and reducing the impact of security incidents. Organizations use MTTR to assess and improve their incident response capabilities, optimize maintenance processes, and ensure business continuity.