Hi! I've done a few long running tests on the NAPA Floor-Dry oil absorbing substrate and it's been a few weeks and every morning I throw it out to thaw and every night I throw it back into the freezer to freeze. It's been almost 30 days now and I've not seen any decomposition on the material. I will caution that I have been told that not all of the Floor-Dry oil absorbing substrate is created equal. Some will turn to mush and some won't. My batch is doing well but from what I've seen, the Floor Dry stuff is pretty trust worthy. A few tests before use is always a good practice especially when each bag only costs 5 bucks.