That's a hard thing to calculate. Like you say pressure ; weather ; all kinds of things. Takes you longer too if your new to the area. Some years I've hunted gun and bow and came up empty after 3 months of on off hunting.I saw deer but nothing went right. This year I shot 4 in a 30 day period. 1 -bow 2-handgun-1shotgun. Next year might struggle to shoot one again. I guess if it was guaranteed it would be called gathering instead of hunting.