Based upon where we are (in the middle of the woods in Central Florida) I believe that we could last indefinately. We have the chickens for eggs. Here we can grow our garden 12 months out of the year. Usually I skip the summer because it is too hot but if I had to I could plant then also which would give me three full growing seasons. We have two wells so water would not be a problem and we have a small citrus grove with about 25 trees that give us oranges, lemons, grapefruits and limes. We have all kinds of game that I could hunt from my front porch, i.e. rabbit, pig, snake, etc. Plus we are near a lake that has many fish. I think we could live very well if I ever had to. We have actually thought about this situation.