The commute is 1:45 for me now because I am not in great shape. It's only actually 18 miles or less according to the map and because I will only use roads when I won't interfere with traffic. I am thinking that I MAY get the ride down to 15 miles if I get clever and can find some shortcuts that make sense. Either way 15 miles on a mtn bike is still over 1 hr. I'm thinking I may be able to convince myself that I am actually putting money in the bank with each ride and end up getting a road bike. I've never had a road bike but I know I can go much faster with the same effort and maybe now work up as much sweat.