euph,

to be honest, it's very difficult and certainly not efficient to always play a preset number of hands. There will be times when you are just lethargic, you don't feel like playing, playing poorly, etc., where you shouldn't play as many hands as you'd like. And there are other times when you have nothing better to do, you're running hot, you're confident, playing well, etc., where there's no reason to quit playing.