six o'clock
If they make difficulties , I shall camp in the entrance and ` hold up ' every messenger who attempts to pass out . But I am accustomed to have my own way with these good people . I should not hesitate to ring up Buckingham Palace , if necessary , as they very well know ! So you may rest assured it will not leave London until six o'clock . It gives you ample time . '' Therefore the doctor said : `` I understand . It does not come within my own experience ; yet I think I understand .