Residentials and generators - all day.

I'm sure it will last quite some time if you never open the doors. But honestly we use our refrigerator, which means the doors get opened a pretty fair amount. How long will stuff stay cold/frozen if the doors are opened frequently. I would hate to have a fridge that required careful usage of it. When I want a cold drink or ice cream, I want to open the door and get it, and not be overly concerned if I don't immediately close the door.