I can't give an exact one-way distance because I often make a loop or several segments between home, school, and work. Depending on where I'm sleeping (my place or BF's) and my work/class schedule, my daily roundtrip total mileage is anywhere from 11-25. Lately I've been getting more creative with multi-mode commuting - for example I have a weekly morning commitment that is in another part of town so I just take my bike on the light rail to make that leg of the trip faster. Also, one of my dreaded long hills is all along a major bus line, so I give myself permission to hop on the bus at any time if I'm feeling poopy.