D.C. Mun. Regs. tit. 7, § 1532
1532.1 Every Board meeting, except meetings with Investment Managers, shall be adjourned by the Chairman without motion four (4) hours after the meeting shall have been called to order; Provided, however, that upon motion, duly seconded, and approved by a majority of Board members present, a Board meeting may continue for a period longer than four (4) hours.