midnight
No more than is necessary to save appearances . She told me that the jailer was devoted to her . He will meet you to-night after dark on the hill , to arrange matters . '' `` Say that we get from the prison by midnight . Then it will take at least three hours riding to reach Boston -- though we shall not enter the town . '' `` Three hours ! Yes , four , '' commented his friend ; `` or even five if the night be dark and stormy ; and such a night has manifest advantages .