[Hoss1193]

I find that if I eat sensibly after 5 hours or so (not something like a burger..more like grilled chicken sandwich or fruit plate), avoid even occasional beer, and stick to continuous water to keep myself hydrated, I'm good for 10-12 hours. Even the frequent bathroom breaks necessitated by the constant water help, since it gets me up to stretch the legs at least once an hour. Also, you don't HAVE to concentrate hard on observing EVERY hand you're not in. Just casually observe maybe one hand an orbit (may not be able to afford that luxury in shorthanded game).