Any order granting a stay prior to the filing of the exchange's reply will expire by its terms within such time after service of the Commission's ruling on the petition, not to exceed ten days, as the Commission fixes, unless within the time so fixed the order, for good cause shown, is extended for a like period or unless the exchange consents that it may be extended for a longer period. In any case, the exchange may move for dissolution or modification of the stay, and the Commission will proceed to determine such motion as expeditiously as the ends of justice require.
17 C.F.R. §9.24