I haven't commuted yet as I'm still trying to find a bike. But I did ride my "race" oriented road bike on the same route. It was just over 14 miles one way and took me 50 mins partly due to all the lights not timed for bike speeds at all. Add in the extra time for hauling gear and more wind resistance and I'm looking at at least an hour. I think that is fine. Much more than an hour and I'd start to wonder about the value of commuting unless I had a flexible job (I don't - I teach) or a lot of time on my hands.