Iowa Code § 63.8: Vacancies — time to qualify.

Persons elected or appointed to fill vacancies, and officers entitled to hold over to fill vacancies occurring through a failure to elect, appoint, or qualify, as provided in chapter 69, shall qualify within ten days from the county board’s canvass of such election, or within ten days from such appointment or failure to elect, appoint, or qualify, in the same manner as those originally elected or appointed to such offices.