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For human-ish blob (edit: on a parachute) weighing 100 kg dropping from 20 km, I got around 14 minutes under the simple equation of motion, with drag proportional to speed squared. It'd probably be closer to 10 minutes for stratified atmosphere, but I can't be arsed to calculate it that precisely. :PDude how long do you think it takes to ride an ejected pilot's chair with parachute down from 70k+ feet? That's gotta be like something around 30 minutes.