I keep mine 3 to 4 days in the garage, hanged head down. I built a closet just for that purpose. Then I take it to the butcher and he processes it within 3 to 4 days. That's about 7 or 8 days rest before the meat is vaccum packed.
What is important is the temperature. Make sure you keep your meat at a temperature just above freezing maybe 2 or 3 C (not a problem in here). If the temperature is higher you have to process it faster.
My father in law bought a butcher fridge from a shop that went out of business and installed it his garage. We can keep the meat there for 8 to 10 days in near perfect condition.
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