You put the matter more flippantly, Mr. Holmes, than you would probably do if you were brought into personal contact with these things. Your advice, then, as I understand it, is that the young man will be as safe in Devonshire as in London. He comes in fifty minutes. What would you recommend?” “I recommend, sir, that you take a cab, call off your spaniel who is scratching at my front door, and proceed to Waterloo to meet Sir Henry Baskerville.” “And then?” “And then you will say nothing to him at all until I have made up my mind about the matter.” “How long will it take you to make up your mind?” “Twenty-four hours. At ten o’clock tomorrow, Dr. Mortimer, I will be much obliged to you if you will call upon me here, and it will be of help to me in my plans for the future if you will bring Sir Henry Baskerville with you.”
reference here in the BBC series that is changed when homles makes up his mind/ informs them of his decision to take the case quicker.