You can see the difference between the two at a glance. On the Gantt Chart, a summary task bar always shows the summary task duration (black line) and the sum of the durations of its subtasks (blue bar), like in the picture below. But be careful - changing the duration of the summary task doesn’t necessarily change the durations of the subtasks. You can change the duration of a summary task the same way you change a regular task. Your changes might conflict with the task dependencies or task constraints Project is tracking, which can throw a carefully constructed schedule off track. If the new duration is an estimate, type a question mark ( ?) after it.īe careful about changing a duration by using the Start and Finish columns, especially for linked tasks or automatically scheduled tasks. In the Duration column for the task, type the duration in minutes ( m), hours ( h), days ( d), weeks ( w), or months ( mo). You can change a task’s duration at any time to reflect the actual amount of time it needs.
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