i think this is a subject better left alone 
but of course i won’t do that
according to wikipedia, average walking speed is 5000m/h, that would be 1.38m/s, or 83m/min, or 83m/10 turns, or 8.3m per turn.
So, one tile is 8.3 meters, if our chars would simply walk around. So, just don’t think about that.