If I have more than an 8 hour day in my calendar "error" will be greater with longer time period. I tried with whole year, result is 365,88 days. When i zoom in Gant chart it ends at 5 pm of end date.
If I enter same date for start and end, result is 0.88.
Can't get number without decimals.
It's hard to believe that such complex program can't do that simple math.

Sorry for wasting your time, I'm back to excel and manually entering Edays