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We continue to use the CPM definitions. There are 3 durations:

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Target Duration

This is known as Planned Duration in Legacy CPM.
This is the duration manually set by a planner; it’s the anticipated number of days the task will be worked on . Excludes non-working days (like weekends and holidays) and doesn’t anticipate any issues. The Target Duration cannot be changed after the task has started.

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Days on Task

This is known as Actual Duration in Legacy CPM.
The number of days between the Actual Start and Actual Finish. If the Task hasn’t finished yet, then it’s the number of days between the Actual Start and Today. If there is no actual start, then this value is 0.

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Days to Finish

This is known as Remaining Duration in Legacy CPM.
The number of days between today and Target Finish. If the task hasn’t started yet, it’ll be the number of days between the and dates. If the task is Finished, then this value is 0.

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Total Duration

This is known as At Completion Duration in Legacy CPM.
TotalDuration=DaysOnTask+DaysToFinishTotalDuration = Days On Task + Days To Finish Note that the total duration is the same as the number of work days between Effective Start and Effective Finish.