Mich. Comp. Laws § 324.61707
If a finding is not made as set forth in section 61706 at the time the order for unit operations is made, the supervisor on the supervisor's motion or the motion of any interested person after notice shall hold supplemental hearings to determine if the plan for unit operations has been approved. If the written approval is found, then the supervisor shall make a supplemental order declaring the plan effective and setting forth the date for the commencement of unit operations. If the written approval is not found within a period of 6 months from the date on which the order providing for unit operations is made, the order shall be ineffective and shall be revoked by the supervisor unless for good cause shown the supervisor extends the time for an additional period not to exceed 1 year.
MCL 324.61707