I'm a loooog time MS/Windows user (DOS 2.1/Windows 1.1) who made the switch a little over 2 months ago. The longest I can ever remember Windows running was about 2 weeks. Usually after about 2 to 3 days you would start to get small abnormalities that could only be corrected by a restart. However I now have 32 days 12 hours since my last OS X restart and with dozens of programs open. That is just unbelievable. It looks like I will have to do a restart with the software update. So what is the longest others have gone on OS X?