I always had many Unix machines with high uptimes around. My home PC (Linux) typically reboots 2 or 3 times a year. My office DNS server has currently 411 days of uptime and is the best of my bunch ATM.<p>In 2002 I had installed  on  the machines under my guard some program that reported uptime to some website. One of my machines, an SGI Indy workstation, had a high uptime, about 2 years. Then a new intern came, and we installed him next to the Indy. Unfortunately, his feet under the desk pulled some cables and unplugged the Indy and broke my hopes of records :)