
That's acceleration not speed.
At average human walking speed of 3 miles an hour...around an hour.

36 mins was very comfotable for my regular 3 mile walk back from school.
Half an hour for me. I walk like I'm on a mission.
I just bomb it into Greggs at lunchtimes and shout COFFEEEEEE! they're like Small or Large...
3 miles an hour is a slow walking pace. Unless you have short legs then your distance is doubed
That's acceleration not speed.
And he is still wrong as it depends on altitude, he might want to do this walk on Everest.
If I was walking at 3mph I'd feel like I was dawdling.
 
	