California Code, Health and Safety Code - HSC § 114016

(a) Except as specified under subdivisions (b) and (c), potentially hazardous food that is cooked, cooled, and reheated for hot holding shall be reheated so that all parts of the food reach a temperature of at least 165°F for 15 seconds.

(b) Except as specified under subdivision (c), potentially hazardous food reheated in a microwave oven for hot holding shall be reheated so that all parts of the food reach a temperature of at least 165°F and the food is rotated or stirred, covered, and allowed to stand covered for at least two minutes after reheating.

(c) Ready-to-eat food taken from a commercially processed, hermetically sealed container, or from an intact package from a food processing plant shall be heated to a temperature of at least 135°F for hot holding.

(d) Reheating for hot holding shall be done rapidly, and the time the food is between 41°F and 165°F shall not exceed two hours.

(e) Remaining unsliced portions of roasts that are cooked as specified under Section 114004 may be reheated for hot holding using the oven parameters and minimum time and temperature conditions as specified in Section 114004.