premise: James Hagan (21 January 1918 – 26 February 1998), known as Jimmy Hagan, was an English football player and manager born in Washington, County Durham, England. He played between 1938 and 1958 for Sheffield United and once for England. As manager he had his greatest successes with S.L. Benfica in the early 1970s.
hypothesis: Jimmy Hagan played for Sheffield United for 30 years.
reason: Jimmy Hagan played for Sheffield United from 1938 to 1958, which means that he played for 20 years.