11 miles each way (about 7 on canal towpath, 4 on road), ride every day.
Usually ride it on a 48:16 fixed gear, 35 mins is my record when the towpath's dry and hard, can take nearly 50 mins when its wet and sludgy. Taking the road all the way and the road bike can get it down to half an hour, but its far less pleasant. SS hardtail in the snow can take an hour!
Never driven it at commute time nor taken the bus. Train station is about a 25 minute walk, train takes around 15 mins then I'd have another 10 minute walk at the other end, and costs money, so not really worth it.
Lucky enough to have ace facilities at the office.