I will show you something that makes MS PROJECT users crazy! Of course I’ll use MS PROJECT 2013.
I will first, create a Brand new Project with one Task with 5 days Duration, like this:
Everything is just fine. Now I will add one Resource with 24 Hours Calendar:
and I’ll assign this Robot to the Task:
or in Task Usage View:
So Robot will work 16 hours at Monday (From 8 AM till Midnight), and from 00:00 to 00:00 at Tuesday!
But, as you can see Task Duration is 5 days! WHY? the simplest answer is: Because MS PROJECT works that way.
The Magic Formula is: Duration = Work / Units. So, Work = 40 hours and Units = 100%. Since 1 Day is 8 hours, Duration = 40 / 100% (8 hours) = % Days.
It may look silly (actually it does), but MS PROJECT Calculates duration in that way, no matter which Calendar did you use. Duration of Project Summary Task is, on the other hand, Finish Date – Start date, and it is 2 days!
But, If you want to see “correct” duration for the Task, you can use, for Example, Duration 1 custom field with formula, like this:
Now I will add this Field to the Gantt Chart, and I’ will get:
And I got what I wanted.
It’s a little bit Tricky, but well….