Quote:
Originally Posted by Rodolphe
With a water temperature of 15.5 to 21°C, some individuals wearing a Personal Flotation Device, could suffer from hypothermia within 2 hrs. 
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So in the summer and early autumn months of the battle, between 2 an 7 hours of consciousness and up to 40 hours of survival (60-70). In the Thames estuary and close to shore even longer. If the bay of Biscay were on the map, it would be in the upper zone of 70-80F.
(Maximum sea temperature is reached in the last week of August)