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Devac  ·  1023 days ago  ·  link  ·    ·  parent  ·  post: A sober discussion: Aliens on Earth

This assumes modern human as a basis with on-schedule fertility, births and mortality, consistently, over hundreds of thousands of years without lag or stop. Using those same modern humans for my example, the estimate delivery date for the book I ordered from Spain is between 1 week and 4.5 months.

I'm still waiting, it says nothing about existence of books or Spain, though.