(1 ) No order issued under this section may authorize or approve Duration of an the interception of any wire, electronic or oral communication for any order of interception etc.
period longer than is necessary to achieve the objective of the authorization, nor in any event longer than sixty days and such sixty day! pkriod shall begin on the day immediately preceding the day on which the investigation officer first begins to conduct an interception under the order or ten days after order is issued .whichever is earlier.
(2) The extension of an order may be granted, but only upon an application for an extension made in accordance with subsection ( I ) of section 37 and the Competent Authority making the findings required by subsection (I) of section 38, and the period of such extension shall be no longer than the Competent Authority deems necessary to achieve the purposes for which it was granted and in no event for longer than sixty days at a time.
( 3 ) Every order and extension thereof shall contain a provision that the authorization to intercept shall be executed as soon as practicable and shall be conducted in such manner as to minimize the interception of communications not otherwise s'ubject to interception under this section and shall terminate upon attainment of the authorized objective, & or in any event on the expiry of the period of said order or extension thereof