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In terms of a single broadcast installment, the record is still held by "The Five Doctors" which, in its original 1983 broadcast form, ran for 90 minutes. Close behind is "Doctor Who", the 1996 TV movie, at 85 minutes (without commercials). In terms of what is the longest serialized story from the Classic Era, the record is held by the 14-episode "The Trial of a Time Lord" (which is so long, it's actually broken down into four storylines). A close second in that form is the 12-episode "The Daleks' Master Plan" (which was not broken down into any particular storylines.)