I think it is not always how much you scout but how you scout and what you do with the info gleaned from scouting.
I'm sure there's some guys who could get more from a topo/aerial combo in an hour than many who could spend 10 hours walking the piece. I agree with the above, wholeheartedly.
I don't scout much at all. I hunt some observation stands, at times. With 350+ acres to hunt, now....it's still amazing to me that it seems small. I'll be out there in a few weeks walking it all over and marking some spots/cutting lanes/making ground blinds/clearing trails/etc...
After that....it'll be the occasional glassing the fields in the summer.....or whatever I can observe during turkey season. But when it's all said and done.....I won't be anywhere NEAR 1:1. Not even CLOSE!