Don't be forgetting about Pacman.yum/apt > Windows Update
My FreeBSD server has a four month uptime.
My iMac would have 3 if it wasn't for the 10.5.6 update.
My harddrve crashes a lot on my MacBook but that has a lot to do with vibration, although the first time it crashed I hadn't moved it for a while; it was just the three month constant downloadig.