Maryland Code, Courts and Judicial Proceedings § 3-219

(b)(1) The arbitration award shall be made within the time set by the agreement.

(2) If the agreement does not set a time, a party may petition a court to set the time.

(3) The parties may extend the time for making an award in writing at any time.

(1) As provided in the agreement;

(2) Personally; or

(3) By certified mail, return receipt requested, bearing a postmark from the United States Postal Service.