Maryland Code, COURTS AND JUDICIAL PROCEEDINGS 8-203
(2) Within 60 days after a circuit court files a proposal under this subsection, the Court of Appeals shall approve or disapprove the proposal.
(3) A proposal approved under this subsection is effective:
(i) 61 days after a circuit court files the proposal; or
(ii) Any earlier date that the Court of Appeals sets.
(b) (1) If the Court of Appeals orders a circuit court to change its jury plan, the circuit court shall do so.
(2) A change that the Court of Appeals orders is effective:
(i) On the day the Court sets; but
(ii) Not later than 90 days after the date of approval of the circuit court’s change.