CMMS, EAM & Spare Parts Management worked example

Wrench Time at 40% travel, parts wait, permits, tools, and coordination allowance: a worked example

What does the result look like when travel, parts wait, permits, tools, and coordination allowance reaches 40%? The full calculation is worked below with real intermediate numbers. a maintenance or asset-management team needs to understand technician capacity, improve planning quality, or compare productive time against paid hours for a technician work week

The inputs for this scenario

  • Maintenance jobs requiring hands-on work: 96 jobs (unchanged)
  • Jobs completed per technician hour: 1.8 jobs / hr (unchanged)
  • Travel, parts wait, permits, tools, and coordination allowance: 40 % (raised for this scenario; the documented default is 35)

Working through the calculation

  • Applying the documented formula (Base wrench time time = planned maintenance jobs requiring hands-on work รท jobs completed per technician hour) to the inputs above produces each figure below.
  • At this operating point the engine returns 74.67 hr for required wrench time time, the number this scenario is built around.
  • At this operating point the engine returns 53.33 hr for base wrench time time.
  • At this operating point the engine returns 40 % for travel, waiting on parts, permits, tools, and coordination allowance applied.
  • At this operating point the engine returns 1.8 pieces / min for jobs completed per technician hour.

How this compares with the baseline

  • Against the tool's baseline example, where travel, parts wait, permits, tools, and coordination allowance sits at 35% and the headline result is 72 hr, this scenario comes in 3.7% above the baseline at 74.67 hr.
  • A figure at this level is achievable when travel, parts wait, permits, tools, and coordination allowance is genuinely sustained, not just peaked for a shift. It treats all jobs as the same average size and bundles every productivity loss into one allowance; a job list mixing five-minute adjustments with multi-hour rebuilds, or a site with severe parts-availability problems, will need the allowance and rate tuned per job type.

Results at a glance

  • Required wrench time time: 74.67 hr (headline result)
  • Base wrench time time: 53.33 hr
  • travel, waiting on parts, permits, tools, and coordination allowance applied: 40 %
  • jobs completed per technician hour: 1.8 pieces / min

Run it with your numbers

  • Every input above is editable in the live Wrench Time calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.