It's nothing magical, just a bike ride. As long as you're in "reasonable" shape
& you have a good bike fit, it just depends on how much time you wanna spend.

My 1st imperial century started with a massive hangover, I was just gonna go
for a short ride to try & work it off. 30 miles into it I was feeling much better.
Stopped for a sammich at 60 miles. One mile led to another & ~6 hours later
I was at 100.

The beer afterwords was _really_ good.

Cheers,

Kelly