31
There are 696 episodes of classic Doctor Who (not including the TV movie), comprising 157 different stories. However a large number of these episodes (108 in total) are 'lost' and it is thought copies no longer exist. The First Doctor: 29 stories (134 episodes) The Second Doctor: 21 stories (119 episodes) The Third Doctor: 24 stories (128 episodes) The Fourth Doctor: 42 stories (172 episodes) The Fifth Doctor: 20 stories (69 episodes) The Sixth Doctor: 8 stories (31 episodes) The Seventh Doctor: 13 stories (43 episodes)
The Seventh Doctor appeared in 43 episodes (comprised of 13 stories).
The Fifth Doctor appeared in 69 episodes.
21
24
42
415 separate stories.
Trial of A Time Lord was made up of 14 episodes.
Up to Journey's End 198 stories 751 Episodes
There will be 24 confirmed episodes.
There have been 753 episodes in Doctor Who.
If you mean full episodes then he had 47 episodes. If you include Christopher Eccelstons last episode 'The Parting of the Ways', then that would be 48, but that doesn't count as he only came around in the last few minutes of the episode.