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That seems off
Where are you getting this millions of years number? Seems really unrealistic considering millions of humans live at altitude and have barely enough oxygen in the air as it is
I rechecked, I will revise it, there are some huge variables and nobody can really agree. It would likely be anywhere between thousands to hundreds of thousands of years, but I have seen some people confidently state that if we're not running industry and most sea life dies rapidly that it could potentially be millions of years but the carbon/oxygen cycle is wildly complicated so it's still a pretty hard idea to calculate.
This exchange talks a lot about how different variables can wildly swing the results. https://biology.stackexchange.com/questions/46125/how-long-could-earths-oxygen-supply-last-if-no-new-oxygen-were-produced