Conversation so far:
When did American football coach Jimmy Johnson go to University of Miami?
In 1984, Johnson was hired by the University of Miami to replace former coach Howard Schnellenberger
How did the University of Miami teams of American football coach Jimmy Johnson do there?
In his five years at Miami, Johnson compiled a 52–9 record, appeared in five New Year's Day bowl games, winning one national championship (1987).
How was American football coach Jimmy Johnson's second season at the University of Miami?
1985 Miami 10–2, L Sugar Bowl

Question: How long did he stay at Miami
Self-contained rewrite: How long did American football coach Jimmy Johnson stay at Miami