Industrial Cybersecurity & OT Risk worked example

OT Change Window Cost at 52% share of production affected during window: a worked example

This scenario runs the ot change window cost calculation on the strong side: 52% share of production affected during window, with every other input held at its documented default. Use it when planning patching, firewall changes, remote access changes, or segmentation work that needs production coordination.

The inputs for this scenario

  • OT change window duration: 8 hr (unchanged)
  • Production cost per change window hour: 12,500 $ / hr (unchanged)
  • Share of production affected during window: 52 % (raised for this scenario; the documented default is 45)
  • Fixed planning and validation cost: 12,000 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Variable OT change window cost = OT change window hours × cost per change window hour × affected production scope) to the inputs above produces each figure below.
  • At this operating point the engine returns 64,000 $ for total ot change window cost, the number this scenario is built around.
  • At this operating point the engine returns 8,000 $ / hr for cost per change window hour.
  • At this operating point the engine returns 52,000 $ for variable ot change window cost.
  • At this operating point the engine returns 12,000 $ for fixed planning and validation cost.

How this compares with the baseline

  • Against the tool's baseline example, where share of production affected during window sits at 45% and the headline result is 57,000 $, this scenario comes in 12.28% above the baseline at 64,000 $.
  • Use it to budget a maintenance or patching window, compare remediation options, or build the business case for or against deferring a change. 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

  • Total OT change window cost: 64,000 $ (headline result)
  • Cost per change window hour: 8,000 $ / hr
  • Variable OT change window cost: 52,000 $
  • Fixed planning and validation cost: 12,000 $

Run it with your numbers

  • Every input above is editable in the live OT Change Window Cost calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.