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Neither. The longest running sitcom is the U.K.'s Last of the Summer Wine.

It aired for 37 years from 12 November 1973 to 29 August 2010.

However if you're asking which one of those two ran longer than the other... that would be Frasier which ran for 11Seasons (1993-2004) while Friends lasted 10 seasons (1994-2004)

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8y ago

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