Apparently, some art students put together a map of zone one of the London Underground, but put times between each station for how long it would take to walk instead of take the tube.
A good proportion of them seem to be under ten minutes, which really doesn’t surprise me. I’ve often looked to see if I could walk a bit longer round somewhere, just for the wander (I quite like ambling around aimlessly) but often don’t know how long it would take. This map will be useful!