MS Project Standard 2021 calculating duration incorrectly

D_Casey 

Hello Casey

In the case shown, the results seem correct, if the calendar weekends (Saturday and Sunday) are non-working days.

As Jhon just commented, you can define the calendar as normally as your project requires, and add a letter "e" (elapsed) in front of the letter d for day in the number of days of duration of the task, since Project considers that duration as natural time or elapsed, without considering the non-working time of the calendar.

For example, a Duration of 1ed=24h and 90ed=90x24h regardless of calendars and hours per day.

You must keep in mind that in this type of elapsed time duration, when assigning a resource, it will work the entire time of the task (24 hours), regardless of its calendar.

By the way, for Project, a task with a duration of 30 working days, starting on January 1 early in the day, if all days are working days, ends on January 30 at the end of the day.

On the other hand, if the duration is of type ed (elapsed time), the task will end at the same time it started.

I also recommend that you provisionally observe the date times by changing the format to Wed 01/28/09 12:33 in the General tab of the Project Options.

And one last trick, perhaps simpler than all of the above: select the task in Manually Scheduled Mode, manually enter the Start and End date you want, and select the task again in Auto Scheduled mode.

I hope I've helped.

Ignacio

Dale_HowardMVPhere is a screenshot; notice that the durations showing days are correct, but the ones showing weeks are not - where "12 weeks" is shown, it is calculating to 12 days. These are fixed duration tasks, no resources, standard 40 hour workweek.