Sec. 11-1.606.   Duration of grant.
   (a)   A franchise shall be effective on the 31st day after the offer of the franchise agreement provided the grantee has filed, within thirty (30) days after such effective date, a written instrument, in accordance with subsection (b)of Section 11-1.605 of this article, addressed to the Board accepting the franchise and agreeing to comply with all of the provisions thereof. If an extension is granted as set forth in subsection (b)of said Section 11-1.605, the franchise will be effective the first day after the date of acceptance.
   (b)   A franchise or license shall expire twenty (20) years after the acceptance thereof, unless sooner terminated by ordinance. (§ 1, Ord. 961, eff. October 27, 1983)