"The Simpsons:" 23 seasons
'The Simpsons': In it for the long run
Not counting variety shows and unscripted series, these are the longest-running prime-time TV shows.
February 17, 2012 at 9:20PM
"Gunsmoke:" 20 seasons
"Law & Order:" 20 seasons
"Lassie:"17 seasons
"The Adventures of Ozzie & Harriet:" 14 seasons
"Bonanza:"14 seasons
"Knots Landing:"14 seasons
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