four o'clock in the afternoon
when you think it is time to begin , stir me up . '' In half an hour the breeze had increased so much that the boat was running along three knots an hour . By eight o'clock she was doing a knot better . So she ran along till , at four o'clock in the afternoon , the wind died away again , and they could just see the masts of the ships at Callao in the distance . `` I should think that we are about fifteen miles off , '' Harry said . `` About that , '' Bertie replied . `` We had better get our oars and help her along , she is not going much more than a knot through the water an hour . ''