My commute is only 4 miles but I have done it every day for a year now and I love it. I push myself when riding in so do it in 10 minutes, we have reasonably good facilities so I have a massive locker with another wardrobe in it and the feeling of being freshly showered in clean clothes after a work out for your day of work is lovely. The nice thing about such a short commute is that you can also jog in when feeling extra energetic and it makes it a fairly unobtrusive work out and way of losing weight if you need to ( 6 1/2 stone in the past year). I add another 5 - 10 miles on my ride by going to the gym etc but its my favourite part of the day getting on my steed before or after work. Once you get into it, it becomes hard to think of reasons not to ride and even harder explaining to friends / colleagues why it is so much fun!