Originally Posted by
StephenH
If you had taken 8 hours instead of 6, you'd probably be talking about how easy it all was instead of it being "all you could handle". If you try hard enough, you can ride 20 miles and be completely wiped out, or you can back off on the speed and go all day. So don't rule out the hilly rides, take your time, crank up the hills, and there's lots of fun to be had there, too.
+1
Slowing down by 0.5 mph makes a huge difference in how you feel, and by the time you take that to 2mph, it's the difference between killing yourself and being bored silly. Congrats on your first century, and don't be afraid to try something more ambitious.