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It depends on the conditions of course, but if dry ice is kept in a closed container it will sublimate (change from solid to gas) at a rate of about 5-10lbs every 24 hours. 2. If you put dry ice in a bottle with water and close the lid it will expode in about 10-20 seconds. + 40 others found this useful.
If you can get dry ice, a 50 pound block will protect solidly frozen food in a full 20-cubic foot freezer for three to four days. If dry ice is not available and/or you do not have a thermometer in the freezer, then the question of safety becomes a bigger issue the longer you are without power.