I have started riding the whole way to my office on occasion instead of bike-train-bike. The commute is almost exactly the same distance as yours. I have quite a few stop signs and lights in the last 10 miles. It takes me 2hrs 15min, and that's not taking it easy. It's flat here, so wind is the greatest hinderence, especially since I do it on a fixed gear Langster. I'm quite tired when I get home a night.