This brings back bad memories for me ...
When I was shacked up with this loser of a woman many years ago, our power got shut off (she was getting evicted anyway, so nobody cared) & I lived out of an Igloo cooler. This is the one that has insulation in the cover. I used to get right around 1 week to 8 days out of several bags of ice with the indoor temp hovering in the low to mid 90's.
By the time I rigged up an extension cord to steal power from the included hot water heaters' fuse panel, all the food had rotted in the fridge, so even though we had power again, opening the fridge was out of the question!