The correct answer is Cycle time.

Cycle time measures the elapsed time from when active work on a work item begins until that work item is completed. This metric directly reflects the duration the question asks about and it is the standard DevOps KPI for individual work item completion time.

Lead time is not correct because it measures the time from when a request is made until it is delivered to the user and it therefore includes waiting time before active work begins.

Throughput counts how many work items are completed in a given period and it does not measure the duration of a single work item.

Application failure rates measures the frequency of production failures or errors and it is unrelated to the time to complete a work item.

Burndown trend shows how remaining work decreases over an iteration or sprint and it tracks progress at a team level rather than measuring time for a single work item.

Deployment speed refers to how quickly changes are deployed to environments and it does not indicate how long an individual work item was worked on.

Defect escape rate measures the proportion of defects that reach production compared to defects found earlier and it is not a duration metric for work items.

Mean time to recover measures the average time to restore service after an incident and it is an operational reliability metric not a work item completion time.

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