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Usually let hang for 3-5 days. In Northern washington October on. Occasionally September deer I just process immediately. Mostly because they are boned out and the temps are warmer.
I have butchered several deer at home and will tell you that hanging is not necessary. I usually debone the deer in the woods and let the meat sit in the fridge until I can cut and wrap the meat. We eat some fresh, that night, and it never taste's wild. The real trick is to trim it real good and to not let it sit in it's own blood for too long. Normal time from hoof to freezer is about 2 days and I never have a complaint about the taste of the meat.
I use a side by side fridge (taller) to keep them cool till I can cut them up. I have gone two weeks before cutting them up. Keep temp below 40 degrees, life begins at 40.