My 52 quart was used 28 days straight for my gf and myself. The time it blew through ice in 24 hrs, we added 20lbs of fresh ice, not block ice, to an already high 30 degree cooler 3 weeks into our trip. I already had contents as well as left over ice and water. I would drain off water as needed with a short hose I kept attached to the cooler because the cooler didn't leave my vehicle the entire trip. The hottest interior temp I remember seeing was over 130 degrees with the windows cracked, vehicle locked with windshield shade when we weren't driving. It gets very hot mid June in the deserts of Cali, Arizona, and Utah... Most coolers will be used in conditions a little over half those temperatures. I wish I could afford a fridge, but the cooler was the next best option for us.