When it's all said and done, it's about the rider. I have a 6 mile commute and I normally do it in 28-30 minutes. One day I decided I wanted donuts on the other side of the city so went to the car and the battery was dead (left my lights on), well I had my backpack on and knew I had to be at work so I booked it as fast as I could with 12 lbs on my back (backpack weight is 4lbs). I made it to work in 24 minutes. I guess it comes down to if you're motivated or not, I guess I was that day!