21 minutes

I overslept on the bus on the way back home. By quite a lot. Near the place where I alight, is a canal. Beside the canal is a 2km jogging track. Plus a bit of distance before the start point and after the end point, it's about 2.1km. I decide to be Scrooge, and walk the canal home. I timed. I took 21 minutes to do it. At the end of it, the back of my shirt has become a map.