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'.
(..) Then be here. Look at you, Peter. Your grades have been steadily declining. You're late for class. You always appear exhausted. Your paper on fusion is still overdue. I know. I'm planning to write it on Dr. Otto Octavius. Planning is not a major at this university. Octavius is a friend of mine. (..)2004 Spider-Man 2