SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/dad-two-hour-rule

How long can perishable food sit out of refrigeration before it is unsafe?

No more than 2 hours.

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  1. 4 hours
  2. 6 hours
  3. 2 hours ✔

Why: Perishable food left out longer than 2 hours can grow harmful bacteria. Put leftovers in the fridge before that clock runs out.

Huh, didn't know that: Above 90°F, like a hot car or summer picnic, refrigerate food within 1 hour.

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References

Answer: 2 hours. Perishable food left out longer than 2 hours can grow harmful bacteria. Put leftovers in the fridge before that clock runs out.

  1. FoodSafety.gov: 4 Steps to Food Safety www.foodsafety.gov/keep-food-safe/4-steps-to-food-safety
    Never leave perishable foods out of refrigeration for more than 2 hours.
    Checked 2026-10-10.
  2. FoodSafety.gov: 4 Steps to Food Safety www.foodsafety.gov/keep-food-safe/4-steps-to-food-safety
    If the food is exposed to temperatures above 90°F (32°C) (like a hot car or summer picnic), refrigerate it within 1 hour.
    Checked 2026-10-10.

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