Good Question. When I was younger I remember 6 Mile jogs from one beach to another.
Recently, I was pursuing a subject who gave me a run for my money when he decided to make a run for it. I'd wager it was a good 3 mile dash, Jumping over fences, and through traffic. I was winded and beat at the end of pursuit.
EDIT...I'm with you Esa, I misunderstood the thread myself.