I forgot how to see the Uptime, but by hitting ctrl-alt-del you can see when the last time you logged in was.
I last logged in 2/10/2002 @ 10:58:58PM. So it's been about 6 days since I've rebooted. Definately not a record.

I usually end up rebooting every week or 2 for some reason or another. But as far as my computer, it hasn't been off for more than a few minutes probably since I moved, about 4 months ago. Before that, it was never off. Besides the few minutes it takes to swap nics, etc.. my computer has basically been on 24/7 for the last couple of years.