Conversation so far:
When did Larry Bird retire?
08/18/1992
What was Larry Bird's plan for post-retirement?
Larry Bird and Magic Johnson wrote a book together (with Jackie MacMullan) titled When The Game Was Ours.
Did Larry Bird promote his book?
What other activities did Larry Bird get into post-retirement career-wise?
The Celtics employed Larry Bird as a special assistant in the team's front office from 1992 until 1997.

Question: Why did it only last until 1997?
Self-contained rewrite: Why did Larry Bird's employment as a special assistant in the Celtics' front office only last until 1997?