Mean Time to Repair (MTTR) is the average elapsed time between when a fault is reported on an asset and when the asset is confirmed as restored to working condition. In Zoho FSM, MTTR is calculated across all completed Work Orders for a period, using the Work Order creation timestamp as the fault report time and the completion timestamp as the resolution time. A lower MTTR indicates a more responsive and efficient service operation.
MTTR encompasses all time segments from fault report to resolution: time to dispatch a technician, travel time, diagnostic time on-site, parts procurement time (if a return visit is needed), and repair execution time. Identifying which segment contributes most to MTTR in the FSM data directs improvement effort to the right place. Slow dispatch time suggests scheduling inefficiency; long diagnostic time suggests skill or information gaps; parts wait time suggests inventory management issues.
MTTR measures total elapsed time from fault to fix, including multi-visit scenarios. FTFR measures the proportion of jobs completed in one visit. Both metrics are needed together: a high FTFR tells you that most jobs are done in one visit, but a high MTTR on those single-visit jobs might indicate agents are spending too long on-site. MTTR gives the time dimension that FTFR alone does not capture.
Start by segmenting MTTR by Work Order Type and Asset Category in FSM reports to identify where average repair times are highest. For high-MTTR categories, review the job detail data: are technicians spending long periods diagnosing rather than repairing? Are parts waits extending jobs? Are complex jobs being assigned to less experienced agents? Each root cause leads to a specific operational change such as diagnostic aids, stock pre-positioning, or skills-based routing.
MTTR calculated from Work Order creation to completion includes all time, including any periods where the appointment was on hold waiting for parts. This is the true customer-facing repair time and is the most meaningful measure of service performance. If you want to measure the technician’s active repair time excluding external delays, FSM’s appointment check-in and check-out data provides the on-site duration, which can be separated from the total MTTR in custom reports.
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