https://eos.org/articles/chicxulub-impa ... mal-system
At least 150k years.
And modelling suggests that some water would still be at 90⁰ 2.1M years later
Chicxulub impact crater created long lived hydrothermal system
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jimbob
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Chicxulub impact crater created long lived hydrothermal system
Have you considered stupidity as an explanation