I pretty much agree with everybody else. You have to "play it by ear". Tonight for example, I started 10 minutes early, played for two hours, took a 5 minute break and played 21/2 more hours. They got their money's worth tonight!
Who knows, tomorrow might be totally different. I have the piano bar job from 5-8, then across town to a different motel at 8:30. Everything is all set up at both places so no real problem other than stamina.
DonM