Using the scopes - I have done a bit of measuring ...
Latitude (N/S): 1o = 950m
Longitude (E/W): 1o = 610m
C212 world is 13o Lat by 19o Lon = 12.3 km (N/S) by 11.6km (E/W)
Players run (F4) at about 5 m/s.
This makes the C212 world 41 minutes (N/S) by 39 minutes (E/W) in size if it were not for the rivers and mountains.
Margin of error = +/- 5%