How long until land life can return after the impact?

So, it finally happened. The Earth was hit by a comet, and anyone outside of a research station at the bottom of the Atlantic is now dead, or dying. So, here's what we need to know: How big would a comet have to be to wipe out life on the surface? What happened to the planet at impact? What specifically killed the surface? How long would it take for the surface to be habitable again for non-extremophile life?

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How long until land life can return after the impact?

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