[Zeno]

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When I was in 20's and played a lot of stud, I was convinced that I started to fade after three hours, but that was just subjective interpretation.

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This is actually an important point. I use to play stud long before I tried Hold'em. Now I have no hard data, aside from my memory, but I am certain that playing 7-stud took more effort and energy than Hold'em so operating at peak performance was more demanding and could be maintained only for shorter periods. Other parameters to factor in are amount of shorthand play and knowing the majority of your opponents before sitting down, as opposed to cracking the safes on a bunch of new faces.

Shorthand play of pot-limit Omaha is also very taxing. On the other hand, playing low-limit Omaha 8 is a snap. In fact, I can play winning Omaha 8, watch baseball and keep a scorecard, read a book, write a love letter, listen to music, evaluate indefinite integrals, and compose villainous screeds in my head for latter posting on 2+2, all at the same time. This may seem a miraculous feat to some but in reality is just a mundane accomplishment in the ever evolving and interesting life of Le Misanthrope . Only Vince L. (or perhaps El Diablo) could do more at the same time – probably by having a monstrous argument with the person seated next to him at the table.

[img]/images/graemlins/smirk.gif[/img] [img]/images/graemlins/grin.gif[/img] [img]/images/graemlins/wink.gif[/img]

Le Misanthrope

EDIT: On the serious side, I said 6-7 hours. If young and rested this is certaintly within reason. But some other parameters would need to be met and those parameters would vary depending on type of game etc., etc.