Incomplete hypothetical, Martin. LTS after what?

I think training in primitive skills, and use of modern survival gear, can extend survival. How long an extension is part of your planning.

Without a well-thought out and provisioned survival retreat in an area that can sustain some agriculture, some hunting, and some foraging, there is little chance for LTS on your own. Every other scenario leaves you dependent on others by definition.

As social animals most of us aren't going to want to survive in isolation for long anyway. After whatever survival scenario, we are going to seek connections and try to start some version of community.

What can we do if we lose the trappings of what we consider normal society, except live off the land directly or through mutual effort with our fellows?

Edit: this is way beyond what a BOB is all about.