One of the leading causes of food-borne illness is improperly cooled food. Cooked foods that are to be stored need to be cooled to below 41°F/5°C as quickly as possible. This should be completed within four hours, unless you use the two-stage cooling method. In the first stage of this method, foods must be cooled to 70°F/21°C within two hours. In the second stage, foods must reach 41°F/5°C or below within an additional four hours, for a total cooling time of six hours.