Conversation so far:
was Jerry Springer in politics?
In 1970, Springer ran for Congress.
How long was Jerry Springer Mayor?
January 1, 1977 – January 1, 1978
Was Jerry Springer a journalist?
Springer was hired as a political reporter and commentator on Cincinnati's NBC affiliate
Who did Jerry Springer work for?
WLWT
Did Jerry Springer work for any other networks?
In 1997, the Chicago-based NBC-owned station WMAQ-TV hired Springer to serve as a news commentator.

Question: How long was he a journalist?
Self-contained rewrite: How long was Jerry Springer a journalist?