# Reply To: Why the total days are in correct in summary task ?

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#6700
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Keymaster

If one or more tasks has a calendar assigned to it that is different from the Project calendar, you will get resluts such as you describe.  For example, using your data I assigned the Standard calendar to the project and a 24-hour calendar to the first two groups.  My project duration now is 39 days instead of 62.

Things like this can also happen under certain circumstances if a resource assigned to a task has a calendar other than the Project calendar.