My goal was simply to start bike commuting again, which I did. Then, I got up to 3 days per week pretty quickly. I would do more, but I need 1-2 days per week for traveling around due to work or taking in clean dress clothes. My commute is only 16 miles round trip, but a ton of hills with about 1500 feet of climbing round trip. I struggle between the guy who does not set mileage goals and the thoughts of different goals. In the end, my commuting is about getting into shape and having some time every day in which nobody can talk to me.