Discussion
Within the Danger Zone, bacteria can double in number in as little as
Answer: B
Correct answer: 20 minutes
Under favourable conditions in the Danger Zone many foodborne bacteria have a generation time of about twenty minutes, so a population doubles three times an hour. Starting from a hundred cells, four hours produces well over a million. This exponential behaviour is why the two-hour rule is expressed as an absolute limit rather than a guideline, and why the last hour of an excursion matters far more than the first.
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