You win some, you loose some. That said, you can never have too much information
To the OP as well:
Sometimes along with the house open/PC Speeches up/tune up (if necesary)/db up etc. I've done times of things within the act. Some examples:
1) how long Ms. X and Mr. X kissed
2) how long the pause was after line X
3) how long actor X had to wait for audience laughter before continuing on with the scene.
In a long run...it helps to alleviate some of the boredom -- and gives you something to look forward to every night!