midnight
`` Motoring all night , from eight o'clock to six ! '' muttered Guerchard under his breath . `` Oh , that will be all right , '' said the Duke carelessly . `` This interesting affair is to be over by midnight , is n't it ? '' `` Well , I warn you that , tired or fresh , you will have to come with me to the Princess 's to-morrow night . All Paris will be there -- all Paris , that is , who are in Paris . '' `` Oh , I shall be fresh enough , '' said the Duke .