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RE: TBD

A report from a study tells us 10 weeks. See here:

https://www.msn.com/en-us/health/medical/booster-shots-protect-against-symptomatic-omicron-infection-for-about-10-weeks-study-finds-which-could-mean-more-doses-for-some-in-2022/ar-AAS7m2P

Then what? Another booster?

As for natural immunity, studies show that on average it lasts for years ( and counting ). See here:

https://www.msn.com/en-us/health/medical/immunity-to-covid-may-persist-for-years-scientists-find/ar-AAKpOp1

Studies from the Cleveland Clinic and several in Israel tell us the natural immunity is superior compared to those of any vaccine. Here’s one for instance:

https://www.medrxiv.org/content/10.1101/2021.08.24.21262415v1

And here:

https://www.news5cleveland.com/news/continuing-coverage/coronavirus/vaccinating-ohio/study-no-previously-infected-cleveland-clinic-employees-who-remained-unvaccinated-were-reinfected

“dropped by up to 25% within 10 weeks”

So it says a particular type of vaccine was quite effective, and became somewhat less effective over some period of time, in the case of its third booster, against a particular strain (omicron) in a particular place and time (while disease rates and immunity levels constantly vary).

Every form of immunity has varying effectiveness and duration curves, against these many variables - natural immunity as well.

Natural immunity seems to be significantly better, but the vaccines are significantly effective, especially in protecting against severe illness and death.