Don Draper's been away for 17 months, but he's got nothing on Basil Fawlty
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"Arrested Development" (7 years)
"Arrested Development": Technically, it's not back yet, but Mitch Hurwitz and Netflix swear we'll be getting new episodes in 2013. That would put the show at a minimum of 7 years away, as FOX aired the last new adventure of the Bluth family back on February 10, 2006. And if it doesn't come back, we can just say I made a huge mistake putting it in the gallery.