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How long would humanity take to rebound from a global catastrophe?

For reasons why there might ever be fewer than 100M humans, see the Metaculus Ragnarok series. An important question is, if most people die, whether humanity will recover, and how long it would take.

Question: If there ever were fewer than 100M humans, how many years would it take for there to be more than 1B humans?

Resolution details:

  • Only humans in the observable universe count.
  • "Humans" are creatures who at least one 2020 Metaculus user would judge are humans if they magically met them.

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