I'm going to start commuting 12-15 miles five days a week. On top of that I plan on doing a Tuesday (40 miles) and Thursday (35 miles) ride. On Fridays it's going to be about 2 hours of mountain biking. Saturdays I'm usually too lazy to ride, but I would like to start doing this 50 mile group ride. On Sundays I usually do about 45 miles.