I am not so quick either it seems and I don't have an hours estimate for similar reasons. Stuff already mentioned, and stuff I thought would be easy, like the nut on the end of the snout.
If I would have been smart I would have seen if I could get it loose with the belt still on. I had things more apart, so instead I needed a strap wrench... the first one I bought couldn't keep the wheel from slipping, it wasn't until I took a look at some craftsman ones, where the strap was a nice rubber (and therefor grippy) that I found the right tool for the job. I probably spent 2 hours of time just finding a competent strap wrench (when you factor in trying and failing, drive times to more than one hardware store, etc).
Un/Install of the SC was this many times over
1. Looks like I should be able to get at that bolt/nut
2. Access issues make it more difficult than I thought at first
3. Go buy another tool and try it (repeat this step until success)
4. Move on from a task I thought would take a few minutes an hour or two later
I don't have a ton of miles on my car (20k), it is garage kept and well washed... I can't imagine what it would have been like if I'd faced any rust.
"Give a man a match, and he'll be warm for a minute, but set him on fire, and he'll be warm for the rest of his life."