Here's a thought. It should run for as long as the warranty exists.
You'll want a "desktop replacement" model and I'd look into one of those laptop cooling pads.
If you get a portable unit, such rarely run full tilt for hours on end.
I'm thinking about getting a P4 3.20ghz notebook, but i've been told they run very hot. I leave my notebook ON for 4-6 days without giving it any rest, may give it occasional reboot but thats all. Would this type of processor stand the heat for so many days?