Although its VERY difficult to stay away from the computer for that long I try my best to take weekends off.
It’s far too easy to become engulfed by the internet and spend every waking minute online. You lose touch with family and friends and reality. Without time to re-charge the batteries you actually end up being LESS productive.
Work hard, work smart, but keep things in perspective and enjoy your life a little. All the money in the world means nothing if you if you never spend it with family and friends.