Depends on the reason why I am playing, and how I am feeling at the time, Poker is a hobby for me and a fun game, Sure I like to win, doesn't everyone? But at the same time winning is not everything, It is all down to the chase! How you play the game, that is what I feel is really important.
Winning becomes less important, than playing your best game, We all suffer from bad beats and suck-outs from time to time, if you can smile at defeat and laugh at these bad beats you can comeback and play better because we all should learn from our mistakes, and not let it get you down or upset.
Playing Poker after having a argument with your spouse, or yelling at the kids, does not give you the right attitude to playing your best game, and can lead to putting you on "tilt" and making dumb mistakes, but with the right frame of mind and the right approach to the game, I can play for hours!
I have played between 8-10 Sit and Goes and a Free-roll tournament in one sitting, But only when I am alone in the house, and I can switch the phone off, I stopped playing Multi-table game's years ago, and only ever play one game at a time now, I find it more fun! Because Poker is Fun!
When the fun Stops, STOP!