I put 4 packs in the freezer for over 24 hours. All packages looked frozen. I put 4 packs in the igloo fridge when the temperature was 90 degrees. After about 20 hours they became liquid again. It was still cool, but not cold in the cooler at the time. I tested it 3 times during a very hot week. There are always factors that contribute, so my experiment wasn't perfect. I thought they might last longer based on the description, I still use them to this day.
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