Cal. Welf. & Inst. Code § 5352.3

If the professional person in charge of the facility providing intensive treatment recommends conservatorship pursuant to Section 5352, the proposed conservatee may be held in that facility for a period not to exceed three days beyond the designated period for intensive treatment if the additional time period is necessary for a filing of the petition for temporary conservatorship and the establishment of the temporary conservatorship by the court. The involuntary detention period for gravely disabled persons pursuant to Sections 5150, 5250, and 5170.15 shall not exceed 47 days unless continuance is granted.