Originally posted by Kevin S
At the other end of the scale. 
Mine is under 20. I park my car 2.5 miles from work and ride the rest about 3 times per week. It's low, but you've got to start somewhere.
Two possible plans for the future are to bike 8 miles from home to the bus, or maybe bike the full 15 miles. Just taking it one step at a time.
Can't wait for my bike to be out of the shop.
Kevin S.
Stick with it, you'll make the 15 miles soon enough. My ATL commute is also 15ish miles. It's not so bad once I got used to it.