My doe from this year has been hanging for 10 days so far. My cousin has a walk in cooler that stays at 37-38 degrees. We butcher our deer together, but right now he's in wyoming hunting elk, so whenever he gets back. I had this same question awhile ago, but I was told by many people that as long asyour walk in coolerisunder 40 degrees, you can wait for long periods of time, up to a couple months. I wouldnt wait that long personally, but that is because I wanna start eatin!