Presumably, this would protect a person for that duration

That's a presumption I am not prepared to embrace, fully.  We know already the vaccines aren't 100% effective against getting ill from Covid.  I would prefer apabetalone with its 100% inhibition and added therapeutic benefits.

At this stage I'll let any further debate on this issue to be picked up by more scientific types.

I am not an anti-vaxer.  I have been 1st-shot vaccinated with the Pfizer vaccine.  And will get the second shot so as to get me into the 90% range of effectiveness ...

JMHO