A couple days ago I:

http://app.strava.com/activities/38339297



Rode with a couple of roadies on a century. Did the first 50 miles up to the state line in about 2 hours--the next 50 miles were hillier and much slower. One of the guys was a beast, he was taking pulls 3-4 times as long as me and the other guy. We actually managed to find a few tough hills on the route. At least tough for me. In my normal rides the only hills I come across are bridges.