Such emergency appointment shall be limited to a period of not longer than thirty days, during which period notice shall be given by the applicant to all parties having a substantial interest, either as owner of or lienor in the subject matter, of any motion to extend such receivership; and upon the hearing on such motion, the court shall hear the matter de novo, and shall discharge such receiver, or shall appoint the same receiver, or other receivers to act with him, or new receivers as to the court may seem right. Unless such receivership shall be so extended, all the rights and powers of such emergency receiver over the subject matter, at the end of such period for which he shall have been appointed, shall cease and determine, and such receiver shall forthwith file with such court an account of his dealing with such estate. The notices required to be given under this section and §§ 8.01-591 and 8.01-592 shall be served, as to residents of this Commonwealth, in any of the modes prescribed by § 8.01-296, and as to nonresidents of this Commonwealth, or persons unknown, or in any case in which the number of persons to be given notice exceeds thirty, in the manner prescribed by § 8.01-319.