The correct option is Cycle time.

Cycle time measures the elapsed time from when work actually starts until it is completed. In Azure DevOps the cycle time widget calculates how long items spend in the active workflow state through to completion so it produces the chart the team described.

Lead time is incorrect because it measures from item creation to completion and therefore starts earlier than the active state the team asked about.

Burndown is incorrect because it shows remaining effort or work over an iteration and does not report per item elapsed time from active to done.

Cumulative Flow Diagram is incorrect because it visualizes counts of work in each state to highlight flow and bottlenecks and it does not directly report the time a single work item spent in active work.

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