seven o'clock
I will pay you a full day 's wages , even if you have to stay only an hour . '' `` You 'll pay me nothing ! '' declared the watchman vigorously . `` I 'll camp right in your service as soon as the seven o'clock whistle blows , and you get on the trail of that missing trunk . '' `` I intend to , '' said Bart . `` I will get Darry Haven to come down here . He knows the office routine .