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The Tonight Show

End of an era: Conan O'Brien airs his last hour-long show

End of an era: Conan O'Brien airs his last hour-long show

After 25 years on late-night TV, Conan O'Brien hosted his final hour-long show on Thursday night.

Don't worry - O'Brien isn't really going anywhere. In January, "Conan" will return to TBS with a new 30-minute format. The network unveiled this plan in May, though on Thursday, O'Brien revealed the show will take a three-month hiatus.

While a seemingly small change to some, it's the end of an era - O'Brien is the longest-reigning late-night host, on the air since he started at NBC's "Late Night" in 1993. When the shift was first announced, O'Brien said his show would get rid of the "traditional" format. It's not entirely clear what that means, though...

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