Cal. Civ. Proc. Code § 2032.340

(a) If any action involving allegations of sexual abuse of a minor, including any act listed in paragraphs (1) to (3), inclusive, of subdivision (a) of Section 1002, the mental examination of a child less than 15 years of age shall not exceed three hours, inclusive of breaks.

(b) Notwithstanding subdivision (a), the court may grant an extension of the three-hour limit for good cause.