I just ran this on my main server:
$ uptime 08:13:32 up 365 days, 19:56, 4 users, load average: 0.07, 0.05, 0.06
Yes, this means I last rebooted this server one year and 20 hours ago. (What was I doing, rebooting at 4 in the morning?)
Mind you, it won’t run uninterrupted much longer. An updated server is waiting to take its place, so that I can then take this guy down, thoroughly clean it (removing one year’s worth of accumulated dust and cat hair) and upgrade it as well.