one o'clock
`` Because we must lunch them , dear , '' she said . `` Think how good they have all been . And we could not start our married life by being inhospitable . It is just one o'clock ; and we ordered luncheon at half-past . Their train leaves the station at half-past four . In three hours , Garth , we shall be alone . '' `` Shall I be able to behave nicely for three hours ? ''