Heck anything can happen after weeks. I dont usually leave my hobby systems on unless I am using them, but I do let prime95 run overnight sometimes. Whatever works, works, and I'll be the judge of my own stability. Its all relative; What is running, what just finished running, what the temp is, karma, etc. I know of a sun box that has not been rebooted or even had a hicup since 1993, thats stable. Our PCs cant touch that period.