nine o'clock
He might come on duty at nine o'clock in the morning , and stop until I relieve him as soon as supper is over . Of course , he would not keep opposite the house , but might post himself a bit up or down the street , so that he could manage to keep an eye on the door . '' `` That would be excellent , '' Cyril said . `` Of course , at the supper-hour he could go off duty , as she could not possibly leave the house between that time and nine o'clock . You always come in about that hour , and I hear you go up to bed . When you get there , you should at once take off your boots , slip downstairs again with them , and go quietly out . I often sit talking with Captain Dave till half-past nine or ten , but directly I can get away I will come down and join you .