It's not the food that is going to be an issue, it's going to be the water. They don't just drink from water bowls, they need misting or a dripper. Also if you leave a large amount of food in the cage the chame will most likely eat it all in the frst day or two since they are pigs. Personally I would never leave my house for over 48hrs. without having some care for my chams. Even when I'm working from 5am-5pm I have my girlfriend come over and take care of them. But I guess it is different for everybody. I think of it this way, how long do you think you could sit in a cage without food, proper water supply, or other necessities for? It's just a thought...