Mine is 25km (15 miles or so) each way. When I'm in shape, it's about an hour each way, rolling hills through busy city streets. My ride is an old 2000 Rocky Mtn Hammer with fenders, slicks and a rear rack. I haul my stuff in waterproof panniers, usually carrying my clothes, lunch and whatever else I decide to bring along. I've been doing this particular route for about 8 months.