law: Emigration Act, 1983
  18. Period of validity of permit.-
  A permit issued under section 17 shall be
  
  valid till the expiry of such period, not exceeding one year, as may be
  
  prescribed, from the date of issue thereof, or till the recruitment of the
  
  persons for whose recruitment such permit is issued is completed, whichever is
  
  earlier.
  Provided that where the holder of the permit has
  
  been unable for sufficient cause, to complete such recruitment before the
  
  expiry of the prescribed period, the prescribed authority may, subject to rules
  
  made in this behalf, extend the period of validity of the permit by such
  
  further period or periods, not exceeding three months at a time.