If thats a starting point Lamb 14.7 IMHO is pretty darn good especially if its pretty hilly. I have a few loops I do on weekdays (in my lunch hour) a couple of hilly ones are around 13.5 miles and the flatter ones are around 18 or so miles, but I am a long way off super fit on the bike yet.
A couple of steep inclines make a massive difference, my 18 mile commute takes me 1 hour 15minutes in to work and around 48 - 55 minutes on way home.
A couple of steep inclines make a massive difference, my 18 mile commute takes me 1 hour 15minutes in to work and around 48 - 55 minutes on way home.