today I will explain how is Work field Calculated when you have Fixed Duration Task Type, and Resource Calendar.
Of, course I will use MS PROJECT 2016!
First, as I always do, I will create new Project with a single Task:
I will create John as Work Resource:
Now suppose that John has day off at Wednesday 11.11.2015, and Friday 13.11.2015. I will change his Standard Calendar:
Now I am going to make Task as a Fixed Duration:
Now I’m going ta Assign john to the Task:
and I will get:
As you can see, Work = 24 hours! and Duration is fixed, and it is 5 days (from Tuesday 10.11.2015 to Monday, 16.11.2015). Why is that so? Because when you have a Fixed Duration Task, and you assign Resource to that Task, Duration, and Start and Finish date will not change, no matter if Resource is available or not through that period. MS Project simply assign that Resource to working days, and then calculate work as a sum of available work during working days through Fixed Duration period, and that is 24 hours in my case.
That is how MS PROJECT works!