Yeah....well, sorry we are not all tough Russian prisoners :)
Mikedoobee has had the most lost boards, lost kites, broken gear and stupid posts I have ever seen in my time on SB. Taking this into account maybe even 10 mins in tropical water is too long. You are 'that guy'...
To be eligible to swim the English Channel you must complete a 6 hr swim in 16 deg water...
Thats in your own skin...
That should give you some idea of what the body can withstand.
Not for me,I am a pussy.I wouldn't dip my little toe in that water.