On average I would say about 15 to 22 feet, with about 18-20 being the most common. Some times you can't go higher, and there have been a few times I had to use all of my 30' bow rope just to get above the deer's eye level if I had to be at the bottom of a ridge, but was watching the top of the ridge.
I always try hard to get some background(leaves, branches, limbs) behind and/or above me when I'm in a tree. Got busted considerably less when I started doing that.

peashooter