CMMS, EAM & Spare Parts Management worked example

Wrench Time at 25% travel, parts wait, permits, tools, and coordination allowance: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop travel, parts wait, permits, tools, and coordination allowance to 25%, then walk the calculation through step by step. Estimate productive technician wrench time after accounting for job count, work execution pace, and non-wrench delays.

The inputs for this scenario

  • Maintenance jobs requiring hands-on work: 96 jobs (held at the documented default)
  • Jobs completed per technician hour: 1.8 jobs / hr (held at the documented default)
  • Travel, parts wait, permits, tools, and coordination allowance: 25 % (the input this scenario stresses; the baseline uses 35)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base wrench time time = planned maintenance jobs requiring hands-on work รท jobs completed per technician hour.
  • Required wrench time time works out to 66.67 hr at these inputs, and this is the headline figure for the scenario.
  • Base wrench time time works out to 53.33 hr at these inputs.
  • travel, waiting on parts, permits, tools, and coordination allowance applied works out to 25 % at these inputs.
  • jobs completed per technician hour works out to 1.8 pieces / min at these inputs.

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 7.41% below the baseline at 66.67 hr.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to travel, parts wait, permits, tools, and coordination allowance, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. 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: 66.67 hr (headline result)
  • Base wrench time time: 53.33 hr
  • travel, waiting on parts, permits, tools, and coordination allowance applied: 25 %
  • jobs completed per technician hour: 1.8 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Wrench Time calculator, set travel, parts wait, permits, tools, and coordination allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.