See how to update activity duration based on dates...
Duration for an activity is calculated using the start and end dates in the project calendar. You are also provided with the capability to manually adjust the duration for an activity, that in-turn updates the schedule dates of the activity.
Set the activity duration by completing the following fields:
Planned Duration: The expected amount of time required to complete the activity.
Remaining Duration: The total working time from the activity remaining start date to the remaining finish date.
At Completion Duration: The total working time from the activity's current start date to the current finish date.
Save your changes.
The Actual Duration is automatically computed and cannot be manually adjusted. It is calculated based on the logic set for WBS activities.