If property rights are still enforced in the turmoil probably indefinitely. Doesn't mean I'd enjoy it, though.
I come from a place where survival agriculture was the norm well into the 1980s. Would have to start having cows and pigs again, need to work out a salting station, which we haven't had for a few decades. I remember soap making was a mess. We got rid of our wood-fueled kitchen at some point, so that's a problem until society settles back in enough to start selling those again. We'd probably have to go back to setting up a corner for a fireplace in the meantime. That's before my time but it should be possible.