(1)Time of adoption. The board shall not adopt a rule until the period for making written submissions and oral presentations has expired. Within 180 days after the later of the publication of the Notice of Intended Action, or the end of oral proceedings thereon, the board shall adopt a rule pursuant to the rule-making proceeding or terminate the proceeding by publication of a notice to that effect in the Iowa Administrative Bulletin. Exception: The board may waive the notice requirements or time periods specified in Iowa Code chapter 17A, in compliance with Iowa Code section 17A.4, subsection 2, or Iowa Code section 17A.5, subsection 2, paragraph"b, " or both.