law: Transfer of Property Act, 1882
  33. Transfer conditional on performance of act, no time
  
  being specified for performance
  Where, on a transfer of property, an interest therein is created
  
  subject to a condition that the person taking it shall perform a certain act,
  
  but no time is specified for the performance of the act, the condition is
  
  broken when he renders impossible, permanently or for an indefinite period, the
  
  performance of the act.