My commute is 8.7 miles one way, but I have stretched it out over the last year or so, and I now do 20 miles there, 20 miles back. I also try to go to the gym/pool Monday Wednesday Friday.
This schedule works well for me, no it is not too much. Also, I am not an Ironman or health nut, just a normal guy trying to get in better shape.
Joey French