Don Draper's been away for 17 months, but he's got nothing on Basil Fawlty
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"Fawlty Towers" (3 1/2 years)
"Fawlty Towers": Where many of the other shows on this list had to be un-canceled to have such a long hiatus, all "Fawlty Towers" — John Cleese's classic Britcom about imbecilic innkeeper Basil Fawlty — needed was the more relaxed British production system. Cleese and co-creator (and his then-wife) Connie Boothe made 6 episodes, didn't have any ideas for more, then got inspiration several years later (and after getting divorced) and the BBC said, "Sure! Why not?" Cleese has said that's it for Basil forever, but I imagine if he had another brainstorm tomorrow, they'd let him make more, more than 30 years after the most recent episode.