Here goes some more correct information:
Symptoms of extended exposure to water at different temperatures
Loss of use of hands and forearms: 3° C 15 minutes
9° C 20 minutes
21°C 3 hours
Loss of mental activity 3° C 45 minutes
9° C 1 hour
21° C 4 hours 30 minutes
Hypothermia and death 3° C 1 hour 5 minutes
9° C 1 hour 30 minutes
21° C 6 hours
Interesting, isn'it? therefore if it can help to answer to somebody's question, we are provided (when required so by law)with life/slide rafts to help survivors while waiting to be rescued.... knowing how to swimm could help, such as a little silly example, to rescue someone from the water to life/slide raft.... Probably you have realized by the chart given above there is not really a lot of time to waste after a ditching situation if your pax are having a bath.....
Another interesting finding from an FAA ditching survivors research in 1998.....
72% of pax needed specific or direct assistance in the use of the life vest. This became a critical problem because
30% of the pax could NOT swim.
42% of the pax later stated that they had not seen the life vest demo and
59% that they had not read the briefing card....
So, hopefully we all see why it is important to make every minute count in case of a ditching.... (both premeditated or unpremeditated)