of Labor may extend the period for a State to make such amendments to its State plan by not more than 12 months, if the State’s legislature is not in session during the 12-month period beginning with the date of the enactment of this Act. Such amendments to the State plan shall take effect not later than 90 days after the adoption of such amendments by such State. (2) This Act and the amendments made by this Act shall take effect on the date that is 36 months after the date of the enactment of this Act with respect to a workplace of a State, or a political subdivision of a State, that does not have a State plan approved under such section 18 ( 29 U.S.C. 667 ).