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Who has been on Jimmy Fallon the most?

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The program has had six principal hosts in its history—Steve Allen (1954–57), Jack Paar (1957–62), Johnny Carson (1962–92), Jay Leno (1992–2009, 2010–14), Conan O'Brien (2009–10), and Jimmy Fallon (2014–)—as well as numerous guest hosts and sidekicks or cohosts, the most significant of whom was Ed McMahon, Carson's
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