Not really. When I was racing a 25 mile individual time trial on the road of over an hour was rather poor. Most came in under an hour. It certainly wasn't herculean. And this was before bike fits, spin classes, power meters (or cell phones), training schedules, or matching booties. The masters guys I ride with occasionally will do 50 mile training rides in well under 2 hours (not a no-drop ride, I get dropped).