law: Indian Contract Act, 1872 
  46. Time for performance of promise,
  
  where no application is to be made and no time is specified
  Where, by the contract, a promisor is to perform his promise
  
  without application by the promisee, and no time for performance is specified,
  
  the engagement must be performed within a reasonable time.
  Explanation:  The question "what is a reasonable
  
  time" is, in each particular case, a question of fact.