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1. you just never know... maybe 3 minutes.. maybe 1, and if you black out you could be under the water forever. Realize that there is a lot more to getting under the water than just holding your breath. maybe you knew that..
2. I don't think there's much in the water to be concerned about.. dive knife.. I suppose the one time you decide not to take it (which I usually do) is when you'll wish you had one. get a nice small one if you're going to get one, I hate the big ones.
3.a way to speed up breath hold practice is to do it with empty lungs.. let all your air out and then hold your breath. deep, full exhales and inhales is a good place to start too. NO HYPERVENTILATING.. but maybe you knew that too. There is a lot more info on training and techniques out there if you do the searching. try searching for information on static tables and see what info you can find.
be careful, do a bit more homework on the breathholding/freediving, and good luck! St. John's.. sounds like a good time.
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