In the last year I've had several part time jobs. 9.9 miles/48 minutes. 12.5 miles/1:20 21 miles/2:20 10.5miles/58 minutes. In all the rides the first five miles was heavy suburban traffic and stop lights. Say an average of 11 to 12 MPH. Rider, bike and all the gear ran 260 pounds for night riding. When I can drop the lights and work in bike gear make it 13 to 14 MPH. Cold weather (32 to 40 degrees) and rain slows things down. Consider fenders.