Mich. Comp. Laws § 105.12
Upon filing the report and award made by any jury with said probate court he shall enter it upon the docket of his proceedings, and a copy thereof may be taken by the city attorney for the use of the council; and at any time thereafter, and within 40 days after the impaneling of the jury making the report, the probate court, upon the application of the city council, shall enter judgment of confirmation of the determination and awards therein made. Unless such application and confirmation shall be made within said 40 days, all proceedings upon that report and award shall be at an end, and a new jury and new proceedings may be had, as in the case of a disagreement of the jury. All parties interested in such report shall take notice of the confirmation thereof. Any such judgment of confirmation shall be final and conclusive as to all parties not appealing therefrom within the time hereinafter provided.
MCL 105.12