141. (1) The duration of a permission shall not be extended under this Chapter (whether the extension is a material alteration or not) more than once.

(2) Where the duration of a permission is extended under this Chapter, the period of the extension shall be less than or equal to the duration of the permission being extended.

(3) Subject to subsection (2), where the duration of a permission is extended under this Chapter, the period of the extension shall be no longer than the deciding authority considers necessary to enable the development to which the permission relates to be completed.