I've known of beaver being left for a week underwater, in winter, without slippage. I would think that they could probably be left much longer, but it's not a good idea.
There are other issues besides hair slippage.
For one, left long enough, the carcass will gas up and float to the surface where it will freeze into the ice. Not a fun thing to deal with.
Another possible problem, other critters may chew on it, if left too long. I've seen Muskrat and even Beaver chew up animals left underwater too long.
My advice, try to make 48 hours your maximum between checks.
Two full days is plenty of time to make a catch and it maximizes your chances over time while minimizing possible issues.
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