Industrial Cybersecurity & OT Risk worked example

Cyber Maintenance Window Utilization at 92% target window utilization: a worked example

This scenario runs the cyber maintenance window utilization calculation on the strong side: 92% target window utilization, with every other input held at its documented default. Use it when scheduling patching, backup validation, firewall changes, account cleanup, or monitoring deployments.

The inputs for this scenario

  • Planned cyber maintenance work: 52 hours (unchanged)
  • Available OT maintenance window: 72 hours (unchanged)
  • Target window utilization: 92 % (raised for this scenario; the documented default is 80)

Working through the calculation

  • Applying the documented formula (Cyber maintenance window utilization = planned cyber maintenance work รท available OT maintenance window) to the inputs above produces each figure below.
  • At this operating point the engine returns 72.22 % for cyber maintenance window utilization, the number this scenario is built around.
  • At this operating point the engine returns 19.78 points for cyber maintenance window utilization gap.
  • At this operating point the engine returns 52 hours for planned cyber maintenance work.
  • At this operating point the engine returns 72 hours for available ot maintenance window.

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 %.
  • Use it while scheduling patching, firmware, or security changes into a shared OT maintenance or turnaround window. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Cyber maintenance window utilization: 72.22 % (headline result)
  • Cyber maintenance window utilization gap: 19.78 points
  • Planned cyber maintenance work: 52 hours
  • Available OT maintenance window: 72 hours

Run it with your numbers

  • Every input above is editable in the live Cyber Maintenance Window Utilization calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.