Well I am on my third Rear Wheel since riding my first fixie 4years ago.
#1 Dura Ace - SOLD with bike
#2 Miche - In my closet with Cog stuck on it
#3 Level

So I know for sure that hubs, or any other parts are not for LIFE. That being said...I will definitely be riding my Level for a longer amount of time, simply due to the investment, if not the fact that I am ALSO in love with it.