law: Apprentices Act, 1961
  6. PERIOD OF 
  
  APPRENTICESHIP TRAINING. -
  The period 
  
  of apprenticeship training, which shall be specified in the contract of 
  
  apprenticeship, shall be as follows :-
  (a) in the 
  
  case of trade apprentices who, having undergone institutional training in a 
  
  school or other institution recognized by the National Council, have passed the 
  
  trade tests or examinations conducted by that Council or by an institution 
  
  recognized by that Council, the period of apprenticeship training shall be such 
  
  as may be determined by that Council or by an institution recognized by that 
  
  Council;
  (aa) in the 
  
  case of trade apprentices who, having undergone institutional training in a 
  
  school or other institution affiliated to or recognized by a Board or State 
  
  Council of Technical Education or any other authority which the Central 
  
  Government may, by notification in the Official Gazette specify in this behalf, 
  
  have passed the trade tests or examinations conducted by that Board or State 
  
  Council or authority, the period of apprenticeship training shall be such as may 
  
  be prescribed;
  (b) in the 
  
  case of other trade apprentices, the period of apprenticeship training shall be 
  
  such as may be prescribed;
  (c) in the 
  
  case of graduate or technician apprentices, technician (vocational) apprentices 
  
  the period of apprenticeship training shall be such as may be prescribed.