I do 12.5 regularly except Dec/Jan/Feb on old 70's Raleigh 10 speed Actually did usual commute last week in -32C froze evrerything !! Good weather usually,35 -40 minutes Best one way time =27 mins in July 2005 a hot one. Been doing it a while over 17,000 km ( approx 10,600 miles as of last Nov) Great exercise Resting HR during peak season 37-40 BPM Turn 65 next month Hope to beat 27 minutes once this summer