ten o'clock
`` 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 to-morrow , 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 . '' `` I will do so , Mr. Holmes . '' He scribbled the appointment on his shirtcuff and hurried off in his strange , peering , absent-minded fashion . Holmes stopped him at the head of the stair .