law: The Prevention of Terrorism Act, 2002
  41. Duration of an
  
  order of inception, etc.-
  1.  No
  
  order issued under this section may authorise or approve the interception of
  
  any wire, electronic or oral communication for any period longer than is
  
  necessary to achieve the objective of the authorisati n, nor in any event
  
  longer than sixty days and such sixty days period shall begin on the day
  
  immediately preceding the day on which the investigating 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 sub-section (1) of section 38 and the
  
  Competent Authority making the findings required by sub-section (1) of section
  
  39, 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 authorisation to
  
  intercept shall be executed as soon as practicable and shall be conducted in
  
  such manner as to minimise the interception of communications not otherwise
  
  subject to interception under this section and shall terminate upon attainment of
  
  the authorised objective, or in any event on the expiry of the period of said
  
  order or extension thereof.