Okla. Stat. tit. 43A § 5-309
No consumer admitted to a state or private mental hospital under the provisions of the Mental Hospital Voluntary Admission Procedures Act shall be detained in a mental hospital against the will of the person more than one hundred twenty (120) hours or five (5) days, excluding weekends and holidays, after the consumer gives notice in writing to the executive director of the facility of the desire of the consumer to be discharged from the facility. If during the emergency detention the consumer becomes medically unstable, the time limit on the emergency detention period stipulated in this section shall be tolled until the consumer is treated at a medical facility and is medically stabilized. The executive director of the facility may designate one or more employees of the facility to receive a notification provided by this section with the same effect as if delivered to the executive director personally.
Okla. Stat. tit. 43A, § 5-309