A little off topic but this reminded me of toll road charges (they charge you based on the number of axles) and how the minimum number of axles to choose from is 2. I wanted to argue with them to charge me less because I technically only have 1 but I had somewhere to be :P that and I didn't feel like being a dick.
Now for my on topic comment. Rear hubs are easy as pie. If you know what you're doing it goes pretty quick. I replaced both fronts and one rear this past summer. 2004 GP GT with 134k miles.