Cal. Labor Code § 1308.9

(a) If the Labor Commissioner provides written consent pursuant to Section 1308.5 for the employment of a minor under a contract described in Section 6750 of the Family Code, that consent shall be void after the expiration of 10 business days from the date written consent was granted, unless it is attached to a true and correct copy of the trustee’s statement evidencing the establishment on behalf of the minor of a “Coogan Trust Account” pursuant to Chapter 3 (commencing with Section 6750) of Part 3 of Division 11 of the Family Code. If the written consent is attached to a true and correct copy of that trustee’s statement, the written consent shall be valid for a six-month period. (b) A person may not apply for the written consent of the Labor Commissioner to employ the same minor under a contract described in Section 6750 of the Family Code more than once in any six-month period. If written consent is issued by the Labor Commissioner for the employment of the same minor more than once within any six-month period, the earliest dated written consent shall be valid and any other written consent issued during that six-month period shall be void.