I let it hang 1-2 days if below 50, maybe longer if down below 40. Above 50, I de-bone and pack in ice until I have time to grind or package steaks. I ALWAYS skin within 2-4 hours of being shot! This simple task releases the body heat the quickest. I've seen snow stand on a deers back without melting. The skin retains heat very effectively. I have buddies that let the carcass hang up to 4-5 days at 50-70 degrees with the skin on. There thinking is that the skin will keep the warm air temps. out! WRONG! When you skin it at that time the inside of the skin will be green and have a disagreeable odor from the bacteria. Not what I want to eat!