Anyone does it?

I tried today and it was great. 30 miles in the morning, 12 miles with climbs in the evening. Felt strong on the second ride, even better than if that had been my first ride of the day.

What does that mean? Not going hard enough on the first one? Or is it normal since I rested for a few hours in between? I rode harder on each ride than if I had done the whole distance in one go, but maybe that just means the effort was too low?

How am I supposed to feel anyway? Pros train like 12-15 hours a week, practically every day, so I can't imagine it's like weight training where you're super sore the next day...

In any case, I feel really good right now.