I have experienced the whole range. When I got my Trillium
the 3 way fridge
wasn't working. I used it as an ice box. On the advice of another member I froze drinking water in two 2 litre pop bottles. I camped in warm weather 70-mid 80's and found they lasted a couple of days; enough for a weekend. In the fall
they lasted 4-5 days. I wasn't prepared to buy a new fridge
; the high price wasn't worth it to me. I bought a used 3 way and installed it this spring. I also have a portable 12v cooler. I found it drained my battery
if I left it plugged in all the time so I plug it in for an hour and unplug it for a period of time before plugging it in again. The time you leave it unplugged varies depending on the ambient temperature.
Hope that helps.