That's an oddly specific ask. The vaccines are absolutely fantastic in the short term, and there's credible evidence indicating the vaccine protection is long term, by analogy with how other vaccines work.

See e.g. https://twitter.com/sailorrooscout/status/141602012829108224... and https://www.thelancet.com/journals/lancet/article/PIIS0140-6...

Also worth noting, see scary stories about vaccine efficacy dropping (coinciding with alpha being replaced by delta)? Turns out the efficacy recovers afterwards. See https://twitter.com/sailorrooscout/status/143849966572136858.... Other real world studies show robust protection in the medium term, see https://twitter.com/sailorrooscout/status/143995133263551692....