Seven o'clock
`` And you will get us leave , sir ? '' cried Singh , as he returned from pulling at the bell . `` Oh yes , I 'll manage that . Seven o'clock , boys , military time ; and now you both be off ; but mind this , I am going to finish my lecture after dinner , for I am not satisfied with what I said . There , right about face ! March ! '' As the boys reached the door the handle was turned and the Doctor entered the room .