OT: How long to get tired playing poker?

[AnthonyV]

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I'm just about to abstain totally from drinking.

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This would be -EV(life/fun).

Anyway, Indy -- I think you're on the right track with eating well and exercising. Those two imo are the most important. Playing in sets and taking small breaks (even as short as five-ten minutes) while playing will increase your energy level and attention span, as well as relieve some I strain.