I'm really not impressed with my stamina when playing for very long live sessions, and I'd like to devise some kind of action plan to improve in this area.
Yesterday, I grinded through a 12 hour live session (which is not very long for many people, but apparently it is for me). I distinctly remember thinking at about the 5.5 hour mark, "Boy I've been sitting here a long time, and I'm not even HALFWAY done yet". I hope this just takes some getting used to.
My mental alertness for the first 9 hours ranged from very good to satisfactory, but suffered a serious decline in the last 3 hours. Perhaps not coincidentally, my game choice was Limit Hold'em for the first 9 hours and ended with 3 hours of Omaha 8. The amount of thinking and analysis I need for LHE is substantially less then Omaha 8, however mental exhaustion was definitely a major factor (e.g. taking 10-15 seconds after showdown to comprehend why I got scooped from being counterfeited, not remembering my hole cards if I mucked - not a terrible thing but more of a litmus test for fatigue, etc). It might have been easier to gauge had I played Omaha 8 for the first 3 hours and then LHE for the last 9.
At any rate, the only simple plan I have for now is: try, try again. I'll shoot for at least 3 12 hour sessions per month until I head to Vegas.
My diet and exercise regime are pretty solid right now, although the sleep schedule is still quite dubious. I've gotta be more disciplined about that.
Results from the session were solid. I earned one small WSOP event buyin. (This is how I measure results these days....) I still need to earn roughly 2.5 more small WSOP buyins to cover all the events I intend to enter. (events: 20-23 and 39-45)