Not sure what others have read but for a good crash cool they say 40's or lower for a minimum of 5 days. That is what I have seen, I on the other hand usually do 2 to 3 days and have nice crystal clear beer..My garage is about 40 now so it works nice..I keep all my beer in there as well.
Primary: DFH 60 IPA
Secondaty: Blond Ale, Apfelwine, Crandaddy mead
Bottle: Blue moon clone,Kolsch, Eds House Ale, Barley wine, Stone IPA, Oatmeal stout, Hefe,
Drinking: 60 minute IPA, Honkers Ale, Wheat, cherry wheat, Appfelwine,
On Deck: Imperial Stout,