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How long do you figure 400 lbs would last per person?

I’m sure of one thing, while salt is essential, Americans in general could cut way back on it without endangering their health.

What do you figure is the minimum required for survival for a fairly active person? IOW, one engaged in survival?

Depends.
If you're using it to cure meat, according to my dad, you'd go thru about 100 ponds every winter, not counting what you ate.
He said, they always brush off the salt from the meat before they moved it from the shed next to the smoke house and into the salt box on the porch.
That way, they didn't have to remove so must salt from the porch box every year.
But they only cured meat in the late fall and winter, and tried to have it all consumed by late spring.
Summers and early fall they ate fresh meat.
And when they needed to cook some of the salt-dried and smoked meat, they'd brush off as much salt as they could back into the salt box, and then wash the meat to remove as much salt as they could before they cooked it.
Dried jerky was different, because most times they'd eat it just like it was.
Occasionally they use a little in their greens as they cook the greens, or sometimes they'd put a little broke into small pieces in their corn bread, like you'd do with cracklings.

The whole point is, if you have to cure meat, you can.

As far as consumption of table salt, when you do more physical work because of gardening, and raising food for livestock, you'll consume more salt, because of what you'll lose sweating it out.

Think about it, and realize the need, if society falls apart.

One other thing, Dad said there needs to be 2 inches of salt between the meat and any thing,
2" between the bottom of the box and the sides and the meat, and 2" of salt between each piece of meat.
Pieces of meat can NOT touch each other, and there needs to be 2" of salt from the top pieces of meat to the top of the box.
NO EXCEPTIONS !
They keep a close nose on the salt boxes too, and worked hard to keep them dry, even in the worst of humidity.
But he didn't say HOW they kept the humidity from the salt box.