8 hrs. isn't that long to play straight, I was on for 14 hours once at a LAN party, It got to the point where my reflexes were so poor that I'd jerk the mouse several seconds I'd already been shot, but that was late through the night mind you.
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"It is by the goodness of God that in our country we have those three unspeakably precious things: freedom of speech, freedom of conscience, and the prudence never to practice either of them." - Mark Twain