4 miles/6.4 km each way, and I usually ride home at lunchtime, so 8 miles/12.8 km for the round trip. The two circuits daily lets me have 16 miles/25.6 km daily. My 4 mile route is 1 mile on 2 lane country road then 3 miles on 4 lane suburban arterial. Marked bike lanes all the way. There are a couple bike paths that cross my route & in the Summer I frequently take a long detour on the path before resuming the trip home.