Conversation so far:
What was Raymond Berry's first coaching job ?
After retiring from playing, Berry joined Tom Landry's Dallas Cowboys coaching staff.
What year did he joined Dallas Cowboys ?
In 1970, after two seasons, Berry took a job with Frank Broyles.
How many years did he work for Frank Broyles ?
In 1973 Berry joined Don McCafferty.
How long did he stayed with Don McCafferty ?
In 1976, Berry joined former SMU teammate Forrest Gregg.
For how long did he work with Forrest Gregg ?
Berry joined the New England Patriots as receivers coach under Chuck Fairbanks in 1978.
Did he got another caching job after New England Patriots ?
Berry left football and worked in real estate in Medfield, Massachusetts, until the Patriots fired Ron Meyer in the middle of the 1984 season and hired Berry to replace him.

Question: How many years he work for the Patriots ?
Self-contained rewrite: How many years Raymond Berry work for the Patriots ?