How often do you reboot your kit? Boot time is such a stupid metric even on laptops and stuff where you just suspend/hibernate.

My BSD systems (not front-facing and therefore on a lesser patch cycle) rarely get rebooted and neither do the processes so this is indeed moot for me.

Proof:

http://i.imgur.com/tZsM82Q.png

Yes that's a memcached uptime on a host that has had 10,185,367,932 cache hits...