five o'clock
`` You must stay to coffee , '' insisted Mrs. Brauner . It should have been served before , but Mr. Feuerstein 's exhibition had delayed it . `` No -- I must work , '' he replied . `` It 's five o'clock . '' `` That 's right , '' said Brauner with an approving nod . `` Business first ! I must go in myself -- and you , too , Hilda . ''