Final answer:
Cooked rice should not be left unrefrigerated for over two hours due to the risk of bacterial growth and potential food poisoning. Refrigeration at or below 4 degrees C (40 degrees F) is necessary to keep the rice safe for consumption.
Step-by-step explanation:
Cooked rice should not be left unrefrigerated for more than two hours. Foodborne illnesses can result from the ingestion of rice that has been left out at room temperature for extended periods. This is because the temperature range between 4 and 60 degrees C (40 and 140 degrees F) is the 'danger zone' where bacteria can multiply rapidly. Foods, including cooked rice, should be refrigerated at a temperature at or below 4 degrees C (40 degrees F) to inhibit bacterial growth. After two hours in the danger zone, the risk of food poisoning increases significantly, and it is not safe to eat even after reheating.
Food safety guidelines strongly discourage leaving perishable food items at room temperature for extended periods. Always ensure leftovers, like cooked rice, are stored properly in the refrigerator to prevent spoilage and reduce the risk of foodborne illnesses.