Actually about 125 miles to be exact, 7.5 miles there, 109 mile ride, 7.5 miles back home.
I did it with 39x16(66gi). Ride was moderately flat with a few short intense hills, about halfway through we had some nasty side/headwind
Everything went smoothly except that my seatpost had slipped down about 2 inches and I didn't realize 'til a couple hours after the fact, when I was wondering why my knees were hurting so bad.
Here's the route:
I didn't find myself to be much more worn out than when I do a 40 miler.
It was a hecka good time.