Emergencies and cold waterQuestion 399 of 566

How long can it take to go unconscious from hypothermia, even in ice water?

  1. About an hour
  2. About 5 minutes
  3. About 10 seconds
  4. About 12 hours
Show answer

Correct answer: About an hour

Hypothermia is slower than cold shock. It can take about an hour.

Source: Safe Boating Guide (TP 511E, 2026), 1 Hour - Hypothermia, page 54

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Questions last reviewed: 18 October 2026