His promotion is long 'overdue'. = He is long 'overdue' for a promotion. [=he should have been given a promotion by now]
Her baby is 'overdue' by one week. [=her baby has not been born yet and it is a week since its birth was expected]
She reminded him that the rent was 'overdue'.
(..) Explains why you think a woman can be king. When did you return, Uncle? A few days ago. I had some things to take care of. Long overdue. I'm glad you're here. Now I know what my first act as queen will be. To execute the man who killed my father. (..)2016 TvShow: Game of Thrones Title: The Door Season: 6 Episode 5