law: Factories Act, 1948 
  71. Working hours for children 
  (1) No child shall be employed or permitted to work in any
  
  factory
  (a) for more than four and a half hours in any
  
  day;
   6  [(b) during the night.
   Explanation :For the purpose of this sub-section
  
  "night" shall mean a period of at least twelve consecutive hours
  
  which shall include the interval between 10 P.M. and 6 P.M.]
  (2) The period of work of all children employed in a factory
  
  shall be limited to two shifts which shall not overlap or spread over more than
  
  five hours each; and each child shall be employed in only one of the relays
  
  which shall not, except with the previous permission in writing of the Chief
  
  Inspector, be changed more frequently than once in a period of thirty days.
  (3) The provisions of section 52 shall apply also to child
  
  workers and no exemption from the provisions of that section may be granted in
  
  respect of any child.
  (4) No child shall be required or allowed to work in any factory
  
  on any day on which he has already been working in another factory.
   4  [(5) No female child shall be required or allowed to work
  
  in any factory except between 8 A.M. and 7 P.M.].