Most of the time I only play about 4 or 5 hours a day. When you go deep or make a final table, you will usually have to spend at least 6-7 hours playing. Unless it is a freeroll, which usually run about 4 hours total.
Yesterday I played for 9 hours straight and in the 9th hour I began to get sloppy. Not in the way you might think. I got a bit annoyed when this guy called my post flop jam with just mid pair (he raised UTG with T7suit, paired the 7) and held up to kill my flush draw (JKsuit, both over cards in play for turn and river). I should have just called his flop bet and taken the cautious route, but I was tired and not thinking my best.
So that took 70% of my 70 blind stack just after the bubble burst. I managed to get some back from the guy in a race where my TT held up against his A9suit. But then comes pocket 7s a few
hands later, and this is where my biggest mistake was made.
He is one off UTG and min raises. I call with the 77 from the button. Flop comes Jc9c6s. I lead out by jamming, and for some reason he tanked with AJ in his hands. He eventually called and I lost, knocked out somewhere in the 40's.
I would have never done that with a fresh mind. I would have either made a small lead out to test the waters, or check/called or check/folded, depending on the size of the bet. Either way, I would have never made such a move with my short stack that late in the game. I don't entirely hate the move, considering it would have worked had my read of his hand been correct. I put him on AT or A8suit. I felt there was a good chance he had no jack and would just muck his ace high, and that even if he called with AK or AQ, I was still looking okay. But it is something I would not have done, knowing his propensity to call an all in with something as mediocre as mid pair--he could have held A9suit and had me all but dead.
Anyway, short story long, I usually tap out around 7 or 8 hours.