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So, in an average sized lake and average weather temps, in the Quetico, what season or range of dates can a person survive a 2 hour or so immersion?

I don't think there is answer for this question because there are so MANY variables involved not just time and water temp.

  How FIT a person is plays a big role. Does your PDF/clothing provide some level of core insulation?

Is the sun shining and or the wind blowing? I'm assuming they capsized in windy conditions?

This link has some good info. I wouldn't worry about
water temps when you plan your solo trips MB, just
PADDLE according to the conditions you find.

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