Quote from another user,
That totally depends on the world size you want to build.
If you want to user physics simulation you should scale very low, i.e. for instance 1m = 32 quants.
If you want your world extremely large go further down. Maybe to 1m = 1 quant.
If you want to get only a very limited world you can go all the way up, like for instance 1024 quants = 1m.