One odd factor which I reviewed a med-study done (published in the summer) on obese people or just those chunky...who get vaccinated, tend to have fat cells which consume the antibodies at a fast pace.
No one says the magic number, but it would appear the antibody protection is mostly all gone in 3-to-4 months. You’d have to be jabbed every 90 days, to have any ‘true’ protection.
Challenge accepted! (s) Pfizer