On the OP:
I generally don't list durations on my show reports, I list all the times though, and I do maintain a spreadsheet on my PC which has all the times and calculates run times. Now that I work corporate, I was told my show reports were "too detailed" because in the "Timing" box, I wrote "doors: 19:01, start: 19:46, mains: 20:32, formalities end: 23:34, House LX Full: 00:15" - apparently that was far more detailed than they wanted. What they wanted was "Doors on time, Event ran 15 minutes late".
You win some, you loose some. That said, you can never have too much information.