Industrial Cybersecurity & OT Risk worked example

Cyber Maintenance Window Utilization at 58% target window utilization: a worked example

Suppose target window utilization falls to 58%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Measure how much of an available OT maintenance window is consumed by cybersecurity work against a target utilization.

The inputs for this scenario

  • Planned cyber maintenance work: 52 hours (held at the documented default)
  • Available OT maintenance window: 72 hours (held at the documented default)
  • Target window utilization: 58 % (the input this scenario stresses; the baseline uses 80)

Working through the calculation

  • The calculation starts from the formula this tool documents: Cyber maintenance window utilization = planned cyber maintenance work รท available OT maintenance window.
  • Cyber maintenance window utilization works out to 72.22 % at these inputs, and this is the headline figure for the scenario.
  • Cyber maintenance window utilization gap works out to -14.22 points at these inputs.
  • Planned cyber maintenance work works out to 52 hours at these inputs.
  • Available OT maintenance window works out to 72 hours at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target window utilization sits at 80% and the headline result is 72.22 %, this scenario lands almost exactly on the baseline at 72.22 %.
  • It computes utilization as planned cyber work divided by the available window, then the gap between your target utilization and the actual figure. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Cyber maintenance window utilization: 72.22 % (headline result)
  • Cyber maintenance window utilization gap: -14.22 points
  • Planned cyber maintenance work: 52 hours
  • Available OT maintenance window: 72 hours

Run it with your numbers

  • To rerun this with your own numbers, open the live Cyber Maintenance Window Utilization calculator, set target window utilization to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.