New series stories are 1 40 min episode or 2 40 mins episodes (Except Turn Left / Utopia / Sound of Drums {three parter}, and the End of Time {60 mins}, and Day of the Doctor{film length}).
Classic stories were 6 to 12 25 min episodes, too many for one disk especially if a remastered version was provided as well.
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My character Tsin'xing