four o'clock
`` It 's first come hereabouts , but you 'd better not leave it too late . Anyway you 'll get a shake-up when the four o'clock patrol comes on . '' `` How 's that ? '' `` Always give 'em a shake-up at four o'clock . Do n't make many odds . You just get up and sit down again . Takes the cold out of your bones if it does nothing else . ''