I just completed my first century yesterday with Dh, and I have been riding since last March or so. I'd been training fairly seriously (for me) since Feb. Wasn't as bad as I expected while I was riding, but when I stopped, I noticed that there was not one thing on my body that didn't hurt. After a couple of good meals and a good nights sleep, I don't feel any worse than I would after, say, a good, hard 35 mile ride. The ride itself took us about seven hours and 20 minutes (average mph of 13.5 mph). That entailed reigning in the pace on the flats when we really wanted to fly and pushing it on the climby bits when I wanted to lag.