What is walking distance to you

[The Person]

3.2 kilometres.

But I've walked from one end of town to the other. That's more than ten kilometres. Not a whopping distance, but my only bodypart that hurt afterwards was my right shoulder. (Very impressive actually, counting that I did not wait at any traffic lights and had no breaks. To me, at least.)

 

[Pongui]

Bipedal locomotion, as we do it, is a real breakthrough in efficiency. A man can walk a horse to death.

Assuming the horse doesn't first gallop over him.