Demurrers must be filed within 30 days of service of Complaint (extensions do not extend time to demurrer) CCP § 430.40
This is a technical giving the judge discretion. Code of Civil Procedure § 430.40 states: (a) A person against whom a complaint or cross-complaint has been filed may, within 30 days after service of the complaint or cross-complaint, demur to the complaint or...