Break mean time to repair into detect, dispatch, travel, diagnose and fix phases, and see which phase dominates.
MTTR is not just wrench time. Splitting it into the phases before work starts and the phases of actual repair shows whether the fix is slow or the response is, which are solved by completely different investments. Availability is far more sensitive to MTTR than to MTBF, and detection plus dispatch is usually cheaper to shorten than travel or spares logistics.
Network MTTR
MTTR = detect + dispatch + travel + diagnose + repair + verify.
MTTR = detect + dispatch + travel + diagnose + repair + verify. MTTR is not just wrench time. Splitting it into the phases before work starts and the phases of actual repair shows whether the fix is slow or the response is, which are solved by completely different investments.
Availability is far more sensitive to MTTR than to MTBF, and detection plus dispatch is usually cheaper to shorten than travel or spares logistics.
This calculator takes 6 inputs: Time to detect, Time to engage the right engineer, Travel or remote-access time, Time to diagnose, Time to repair or replace, Time to verify and close. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.