four o'clock
`` My time is up , '' said Frank , hastily , as he arose to go away . `` You are not about to leave me , Frank ? '' said Kate . `` Yes , I must ; my leave was only till four o'clock , as the Field-Marshal 's note might have shown you ; but I believe you threw it into the fire before you finished it . '' `` Did I , really ? I remember nothing of that . But , stay , and I will write to him .