California Code, Code of Civil Procedure - CCP § 404.6

Within 20 days after service upon him or her of a written notice of entry of an order of the court under this chapter, any party may petition the appropriate reviewing court for a writ of mandate to require the court to make such order as the reviewing court finds appropriate.The superior court may, for good cause, and prior to the expiration of the initial 20-day period, extend the time for one additional period not to exceed 10 days.