If I was here alone, I could probably live a month or more off what I have in the house right now. Having had gastric bypass surgery several years ago, my stomach's about the size of a nickel so it doesn't take much. I would get bored in about a week, though.
With the 2 of us here, we could probably live 10-14 days on what we have in the house, not counting the never-ending supply of eggs.
Of course, at some point I'd have to go buy chicken feed or things could get ugly out in the pens/yard. LOL.
The place where we are living now doesn't have space for a stockpile, or else I'd be building up a stockpile right now. Plus, I don't really eat canned or processed food other than every once in a blue moon. I eat fresh/real food for the most part. If I eat something that is 350 calories, it's best that most of those calories come from nutrients rather than preservatives and additives that you get in canned and over-processed frozen foods.