    ‘Sentence 1:  Special?  ‘Sentence 2: 826. Doctor Who instalments have. been televised  ‘since 1963, ranging between 25-minute episodes (the most  common format), 45-minute episodes (for Resurrection of the  Daleks, in the 1984, series, a single season in 1985, and the  raviva), two feature-length productions (1983's The Five Doctors,  and the 1996 television film), eight Christmas specials (most of  {60 minutes’ duration, one. of 72 minutes), and, four additional  specials ranging from 60 to 75 minutes in 2003, 2010 and 2013.         1ow Jong was. the longest Doctor Who. Christmas.    