I have a 30-40 min walk to my stands. I usually arrive and get setup about 30-45 min before legal shooting hours. Unless the weather does not cooperate, I will stay in my treestand all day. I will begin leaving my stand when legal shooting hour ends, 1/2 hr after sunset. I may come down earlier because of low light conditions and slowly hunt my way back to the truck.
Myself and my group (sons, 2 grandsons and friends) all hunt this way. We have shot deer at all hours of the hunting day.