(a) An order for admission to a developmental disabilities facility or to a program of nonresidential habilitation shall be for a period not to exceed 180 days. Prior to the expiration of the order, if the facility director of the facility or program believes that the client continues to meet the standard for judicial admission, a new petition and certificate may be filed with the court. In the event that a new petition is filed, the facility director of the facility shall file with the court a current habilitation plan which includes an evaluation of the respondent's progress and the extent to which he is benefiting from habilitation. If no petition is filed prior to expiration of the order, the client shall be discharged. Following a hearing on the petition, the court may order an additional 180 day period of admission to a facility or to a program of nonresidential habilitation only if the client continues to meet the standard for judicial admission.(b) Additional 180 day periods of judicial admission may be sought pursuant to the procedures set out in this Section for so long as the client continues to meet the standard for judicial admission. The provisions of this Article which apply whenever an initial order is sought shall apply whenever an additional period of admission is sought.