RE: What % of the time...
That is an interesting thought that would play a big factor in how many deer you see. From where I sit I can see about 250 - 300 yards in 3 directions. I sit on a hill looking down into the brush and that gives me a big advantage even over a 20' tall stand. (The hill is about 60' tall). If I wasdown lower and could only see 50 - 100 yards I would have seen fewer deer.
I did see 3 rattlesnakes leaving my stand in the dark in the evenings but no jack rabbits. I haven't ever seena jack rabbit on my property actually, but I have seen a few cotton tails. Where my property is I actually have some real trees and 2 creek bottoms and some hills, not the flat as a pancake mesquite brush flats like you get going out farther west.
I'm really happy with my place out there.