I was just checking my journal for 2006. I rode to work every day until December 18, when my knee blew due to arthritis. I rode my bike on 298 days of the year, missing four days a month while travelling as well as my sick days. I rode just under 5,000 miles in the year. (One bike I rode had no computer so I don't know exact miles.) I averaged 83 minutes a day with cycling and all other exercise.
The main thing I realized is that if I owned a car, I would probably get less than half the exercise I do now. In our busy modern world, the best plan for most people is to incorporate exercise into their daily lives. I figure about 1/3 of my cycling was recreational and 2/3 was utility or transportation riding. (Of course, in a way it was all recreational )
Did anybody else keep records, or can you estimate some figures for cycling and exercise for 2006?