I'm currently at 28 days and 5 hours. Guess that means I last rebooted around New Year's Eve. Going to see if I can get a year's worth of uptime, just for kicks.
I leave mine on all the time, but I do let it sleep when I'm not using it. The occasional reboot when Software Update asks for it and when things go nuts.
Current uptime is just over 9 days. Though it's been up for longer than that before.