Might not exactly answer your question, but [150 individuals](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5756541/#:~:text=Since%20almost%20all%20analyses%20of,social%2C%20political%20and%20educational%20organisations) is the general guideline for a sustainable human population.
On of the reasons posited that humans succeeded instead of Neanderthals is that Neanderthals tended to have smaller societal groups.
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