RE: How many hunters can hunt....
is the 84 acres all wooded? Is it farmland with small pockets of cover? This would all play into my decision on how many guys could hunt it.
And as everyone said, put up as many stands as you can. The more you put up the better your chances of success will be if hunted properly. I tagged a 150 class buck this year simply because I had multiple stands watching one field. While hunting one stand one evening I saw he was using another trail by another of my stands only 180 yards away. Two nights later I arrowed him from that stand. I didn't have to contaminate the area with more scent to put up a new stand, it was already in place, he was already comfortable with it so sneaking into it and getting him in bow range was a piece of cake.