Hey, I did 45 minutes with much less neck/hand pain and I love the pedals! I actually could have easily done an hour but kept having trouble with the gears. I finally decided the boys that did the overhaul on this bike a few years ago really messed up the Shimano SIS system. Remember, I didn't really use the bike after the overhaul so I was thinking it was just me on the gears.
From the first trail ride the other week to today, the gears have been messed up which contributed to two of my crashes - couldn't grab a gear and lost my momentum, falling over because my feet were trapped in the clips. I finally put it on the repair clamp and checked them out - it isn't me, the rear derailleur is definitely out of whack. I messed with it but couldn't really do much for it - so I threw it on the truck and took it to the shop!
I'm kind of ashamed of that since I used to fix this kind of problem for others but after so long away from biking I just don't remember what to do, plus I never saw a Shimano SIS two-lever system before. I think they'll get it right without too much trouble. I had fixed the downshifting which was the main problem just by tightening up the front cable adjustment but then was not able to get it into granny gear, so that's when I decided to let somebody else worry about it.