law: Factories Act, 1948 
  54. Daily hours 
  Subject to the provisions of section 51, no adult worker shall
  
  be required or allowed to work in a factory for more than nine hours in any
  
  day:
   70  [PROVIDED that, subject to the previous approval of
  
  the Chief Inspector, the daily maximum specified in this section may be
  
  exceeded in order to facilitate the change of shifts.]