four o'clock
`` You look tired , '' she said , stopping him . `` You have been working very hard . '' `` I do n't feel quite as bright as usual , '' he confessed . `` It 's the heat , I think , but I 've turned out at four o'clock every morning since harvest began . '' `` Then why not take a few minutes ' rest ? I 'll make you a cup of tea ; I was going in to get some ready . It 's an English custom . ''