Nearly every weekday morning (until the days get shorter) I do a 12-20 mile ride on either my mountain bike or road bike. I try to do it in an hour or less. When I am fortunate enough to have my wife ride with me, I cut it down to 10 miles and just go on the mountain bike (she isn't comfortable on her road bike yet). I don't worry about the time, and while there are a couple of small "hills" where I "sprint" ahead and then wait for her, for the most part we try to stay together and enjoy each others company. It is absolutely worth not getting a hard personal workout to see my wife enjoy riding her bike. I hope this is something that we can enjoy together for the rest of our lives.