Dushi
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“How cold does the water have to be to put a person at risk for hypothermia? Even water temperatures as high as 75 and 80 degrees F (24 and 27 degrees C) can be dangerous, but it would most likely take much longer than 15 minutes to become debilitated.”
https://www.scientificamerican.com/article/airplane-1549-hudson-hypothermia/
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As a rule of thumb, it is estimated that in waters of around 5°C, victims have roughly 60 minutes before hypothermia sets in; at 10°C this doubles to two hours; and at 15°C it extends to six hours.
https://www.telegraph.co.uk/travel/cruises/articles/How-to-survive-if-you-fall-off-a-cruise-ship/