three until five
`` I have got that all fixed , '' said Fred , taking a slip of paper from his pocket as he spoke ; `` I have divided the night into five watches . We 'll let Sam stay on guard until eleven o'clock . I 'll take the watch from eleven P. M. to twelve-thirty A. M. Grant can come on at twelve-thirty and stay until two , then George will take his place and stay until half-past three . John will be the last one and he can be the guard from half-past three until five o ` clock . There wo n't be any need of any one after that because it will be light by that time . '' `` That 's all right , '' spoke up George . `` The only suggestion I have to make is that we rotate the hours , if we keep this up many nights . ''