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C, While I agree with the concept of hardening and acclimation to harsher weather both hot & cold, experiencing a longer time of effective directed energy in very cold water is not something to expect. Even if you could endure an extra 5 or 10 minutes totally immersed, in most cases it probably is not buying you enough time to escape the water without help.

We ussually become uncomfortable well before we are physically in danger and can adjust over time with conditioning. We can’t over come physics, heat loss totally immersed in water is extremely effective and would be hard to over come while alone.