[pzhon]

[ QUOTE ]
How many hands (how long) should I be playing in one sitting to assume I'm getting a fair run of cards.

[/ QUOTE ]
After about 100 hours, the normal swings due to the randomness of a fair deck will be about the same size as the skill advantage of a good player. A good player should expect to be down about 1 time in 6 after 100 hours.

I don't recommend playing for 100 hours at a time. Accept that poker isn't fair in the short run, even with a perfectly random deck.