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Block lasts considerably longer than cubes. Draining melt water adds considerably to days ice will last as well.
A block of ice will last longer in a 200 degree oven than in a tub of cool water.
I use an Igloo Maxcool cooler rated to keep food cold 5 days in 90 degree heat.
Basically it has more insulation that other lesser coolers.
So much determines how long a cooler keeps ice.
How full the cooler is, whattemps foods were at when placed in, ambient air temps, Solar gain or not, how often you enter the cooler...
With our maxcool cooler we can last 5 days without any bought ice.
We typically cook foods we will eat at home and freeze it in day portions. W4e also freeze drinks in qt containers to include water and gatorade.
Maxcool Cooler is generally packed full of frozen food.
Each night before bed, we pull out days rations for next and place it in our daily duty cooler that has stuff we want to keep cool but is not frozen. By lunch the foods are generally sort of thawed out and the water and drinks are starting to thaw. Sometimes we have the prior days drinks ready to go while the new days are still providing cool...
All in all it works well for us, and the frozen cooler still has frozen stuff in it 4-5 ays later when we go home.
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