Haw. Rev. Stat. § 334-60.6: Period of detention.

The psychiatric facility may detain a subject for a period of time ordered by the court not to exceed ninety days from date of admission unless sooner discharged by the facility pursuant to section 334-76 or section 334-74. At the end of the ninety-day period the subject shall be discharged automatically except as provided in sections 704-406, 704-411, and 706-607, unless before expiration of the period and by a proceeding initiated pursuant to section 334-60.3 the facility obtains a court order for the subject's recommitment. Recommitment for a period not to exceed ninety days may not be ordered unless the court determines that the criteria for involuntary hospitalization set forth in section 334-60.2 continue to exist. If at the end of a recommitment period the court finds that the criteria for involuntary hospitalization set forth in section 334-60.2 continue to exist and are likely to continue beyond ninety days, the court may order recommitment for a period not to exceed one hundred eighty days.

Nothing in this section shall preclude a facility from accepting for voluntary inpatient treatment, in accordance with the procedures in section 334-60.1, a patient, for whom the facility contemplates discharge pursuant to section 334-60.7 and who voluntarily agrees to further hospitalization after the period of commitment has expired, or where the patient is no longer a proper subject for commitment.