After dinner, joanne did not put the leftover casserole away until after watching her favorite television show. what is the longest time it should be left out at room temperature?

At most 2 hours

Explanation:

According to my research of various health departments it is said that cooked food should not be left out in room temperature for more than 2 hours, assuming that room temperature is between 40°F and 140°F. This is because after 2 hours bacteria starts to grow at an increased rate and can have various health effects on the person consuming the food. Therefore food is best wrapped and placed in the refrigerator.

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thermal energy is the answer