In 100 temps and trailer in sun, i turn mine on about 24hrs before leaving......i dont put ice or anything in it ( though that would prob cool it faster)....i run a/c. While loading for maybe 3 hrs total...after that, the blue mountains on my coors light stay cold!... :-D . I also have the small dorm fridge on the outside and that lil thing gets cold quick (3-4 hrs)....but only runs on 110v... i put a days worth of drinks in the inside fridge, then when i get to site i plug in and get outside fridge going, then transfer all the beer and soda to outside unit after a couple of hours....works perfect.
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