text1: How many Doctor Who episodes have been shown, in total?
text2: 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 revival), 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 2009, 2010 and 2013.