Seems like he would have erred on the side of a good generous estimate maybe 3 or 4. I am trying to get up the courage to do some commuting, but I am a professional and I think I am not supposed to sweat or something. Also I'm almost 50 yrs old and not dignified for someone of my age. Other than that, I'm good to go. When I got to work today with the bike on the rack, I had to drive home and drop it off because I had to run some unexpected errands and go to a rescheduled dentist appointment. One good thing: I only live about 3 miles from work and partial commute could be a reality (i.e. drive with bike on rack in to work, ride home on bike, ride back and so forth). I can keep 2 changes of clothes in the car. Also I can shower at work very conveniently. Just don't like being the 1st one.