Michigan Compiled Laws, Chapter 330. Mental Health Code § 330.1472a

Sec. 472a. (1) Upon the filing of a petition under section 434  1 and a finding that an individual is a person requiring treatment, the court shall issue an initial order of involuntary mental health treatment that shall be limited in duration as follows:

(2) Upon the receipt of a petition under section 473  2 before the expiration of an initial order under subsection (1) and a finding that the individual continues to be a person requiring treatment, the court shall issue a second order for involuntary mental health treatment that shall not exceed 90 days.

(3) Upon the receipt of a petition under section 473 before the expiration of a second order under subsection (2) and a finding that the individual continues to be a person requiring treatment, the court shall issue a continuing order for involuntary mental health treatment that shall not exceed 1 year.

(4) Upon the receipt of a petition under section 473 before the expiration of a continuing order of involuntary mental health treatment, including a continuing order issued under section 485a  3 or a 1-year order of hospitalization issued under former section 472,  4 and a finding that the individual continues to be a person requiring treatment, the court shall issue another continuing order for involuntary mental health treatment as provided in subsection (3) for a period not to exceed 1 year. The court shall continue to issue consecutive 1-year continuing orders for involuntary mental health treatment under this section until a continuing order expires without a petition having been filed under section 473 or the court finds that the individual is not a person requiring treatment.

(5) If a petition for an order of involuntary mental health treatment is not brought under section 473 at least 14 days before the expiration of an order of involuntary mental health treatment as described in subsections (2) to (4), a person who believes that an individual continues to be a person requiring treatment may file a petition under section 434 for an initial order of involuntary mental health treatment as described in subsection (1).