Mich. Comp. Laws § 168.720: Polls; times of opening and closing.

Sec. 720.

On the day of any election, the polls shall be opened at 7 o'clock in the forenoon, and shall be continuously open until 8 o'clock in the afternoon and no longer. Every qualified elector present and in line at the polls at the hour prescribed for the closing thereof shall be allowed to vote.