I would think that if your vehicle is running and you're charging at over 13.5 volts, then it shouldn't take more than an hour to get down to your set temperature. You could also try putting it on fast freeze (FF) to lower the temperature quicker, but make sure you're not freezing your food inside the fridge when it gets to that point.Yep, bringing up the dead here. lol I just bought a used edgestar fp430 and wondered how long should it take to get to 39* say ambient temp of 90* yeah it's hot here Arizona low desert. I also see that someone added a bullet piercing valve on it to add refrigerant. I put a gauge on it and it was about 1 psi low side so if anyone has any info on any of this stuff would be appreciated.