My notes suggest that the earliest photosynthesis was around ~3.1 BYA, which
concurrently began to create an oxidized atmosphere.  This in turn started
the extinction of anaerobes and the rise of aerobic organisms.

If these notes are relatively accurate, do we have an ballpark idea of the
length of time it took for the extinction of anaerobic organisms?  (e.g.
tens or hundreds of millions of years?)  Regards,  Brett Aubrey.
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