D.C. Mun. Regs. tit. 17, r. 17-3306
The term of a license issued or renewed pursuant to an act listed in § 3300.1 is two (2) years and shall expire on the date established by the chapter of this title relating to the particular occupation or profession unless the Director changes the renewal system pursuant to § 3306.2.
The Director may change the renewal system to a system whereby a license expires on the last day of the month of the birthdate of the applicant for or holder of the license, or to another system, for the administrative convenience of the Director.
If the Director changes the renewal system under § 3306.2, in order to permit an orderly transition, the term of a license that is in effect on the date of the Director's determination may be extended up to three (3) years.
D.C. Mun. Regs. tit. 17, r. 17-3306