Michigan Constitution of 1963, Art. IV, § 33

Sec. 33.  Every bill passed by the legislature shall be presented to the governor before it becomes law, and the governor shall have 14 days measured in hours and minutes from the time of presentation in which to consider it.  If he approves, he shall within that time sign and file it with the secretary of state and it shall become law.  If he does not approve, and the legislature has within that time finally adjourned the session at which the bill was passed, it shall not become law.  If he disapproves, and the legislature continues the session at which the bill was passed, he shall return it within such 14-day period with his objections, to the house in which it originated.  That house shall enter such objections in full in its journal and reconsider the bill.  If two-thirds of the members elected to and serving in that house pass the bill notwithstanding the objections of the governor, it shall be sent with the objections to the other house for reconsideration.  The bill shall become law if passed by two-thirds of the members elected to and serving in that house.  The vote of each house shall be entered in the journal with the votes and names of the members voting thereon.  If any bill is not returned by the governor within such 14-day period, the legislature continuing in session, it shall become law as if he had signed it.