Ah, makes sense. 30 minutes is a very slowly walked city mile for me (25min at a casual, unhurried pace, shaving a couple minutes off that for a 22-23min time w

Ah, makes sense. 30 minutes is a very slowly walked city mile for me (25min at a casual, unhurried pace, shaving a couple minutes off that for a 22-23min time with a bit more bounce in the step but still not jogging or even speed-walking) so I figured it was either round-trip or the slowest speed anyone capable of walking anywhere at all would attain—seems it's the latter.