Graft:
By the time it’s been on for most of the day it seems to stay cold enough as long as you don’t keep opening it every five minutes. And if you put some frozen chops / vegetables in it , that will help it along as well as provide your dinner
Ha fair play! you could always try buying those bags of ice from supermarkets? and stuffing them in the fridge during heatwaves etc
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A better idea is to buy some pouches of Capri-Sun, freeze them at home at the weekend, then put a layer of them on top of whatever is in the coolbox. It takes about three days for them to thaw out fully, then you can either drink them or take them home at the weekend, re-freeze them and repeat. Tesco are doing them at £1 for a box of five pouches at the moment, three boxes should be more than enough.