six o'clock
`` Why do you call her Chee ? '' `` Because she 's so cheerful , an ' because I do n't know her name , '' was the reply . `` It must be pretty near dawn , '' Jack said , after a long silence , with a prodigious yawn . Frank looked at his watch and found that it was six o'clock . It had been a long night . The sun would rise shortly after six . Five minutes later sounds of trouble of a physical nature were heard along the tunnel by which the chamber had been reached .