California Code, Family Code - FAM § 5271

(a) The motion and notice of motion to quash the assignment order shall be filed with the court issuing the order within 10 days after delivery of the copy of the assignment order to the obligor by the employer.

(b) The clerk of the court shall set the motion to quash for hearing within not less than 15 days, nor more than 20 days, after receipt of the notice of motion.

(c) The obligor shall serve personally or by first-class mail, postage prepaid, a copy of the motion and notice of motion on the obligee named in the assignment order no less than 10 days before the date of the hearing.