My commute is 18-19 miles one way, depending on which route I take. I have done 2-3 days per week for years, and the past couple I've car-pooled one way and ridden home the majority of the time.
The past three months, I've been either on travel or working on our new house, which is 12 miles from work and 20ish from our current house. I haven't been able to make the bike commute work out and still be able to work on the house in the evenings, so I've been riding a motorcycle to work. I'm riding my normal evening and weekend group rides, but really missing the bike commute. When we move, I'll go back to 2-3 days a week, both ways.