how long did john kennedy serve as president
John F. Kennedy served as president for 3 years, from 1961 until he was assassinated on November 22, of 1963. It is widely believed that Kennedy's assassination was the result of a conspiracy, not the work of one man, Lee Harvey Oswald. John F. Kennedy served as president for 3 years, from 1961 until he was assassinated on November 22, of 1963.