I ride about this far when I ride in all the way, but that's only about half the time. I love it. The other half of the time I do a mixed ride/bus thing, and one day a week I work from home. A lot depends on route - my ride-all-the-way-in route is quite nice. There's also air quality to think about - I'll shorten my ride if air quality dips too low.

www.airnow.gov