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Rule of Three as far as the wiki applies it means the minimum number of tropes for a subpage is... well, three. :P
For the other end of the size spectrum, the upper of the two numbers down in the bottom-left corner of the page gives the character count for the page. When that gets close to 400K it's time to split the page, as the server starts acting squirrely about it. At 500K things outright break, making for a mess. The number of tropes in a list beyond the minimum is irrelevant, just the page length matters.
As for TDK itself, no idea.
All your safe space are belong to TrumpFor the moment and nightmare fuel subpages, the main Film.The Dark Knight Saga subpages should probably be turned into disambiguation pages. Which is to say cut out the examples (and move non-duplicates to the appropriate pages) and replace them with simple links to the films' subpages. For example, NightmareFuel.The Dark Knight Saga should end up looking something like:
Maybe add a short description at the top. Does all that make sense?
Edited by Discar Writing a post-post apocalypse LitRPG on RR. Also fanfic stuff.Yes, but what I meant to ask was how long a list of examples for one trope should be before it splits off.
Also, the Tear Jerker entry for each of the films redirects to the the subpage for the whole saga and I don't know how to edit that (so it's all consistent).
"but what I meant to ask was how long a list of examples for one trope should be before it splits off."
That is decided by character count, not by how long the list of examples is. Once the list of examples is long enough to kick up a ~400,000 character count, it needs to be split into a subpage(s) for the trope. The same goes for any really long folders, since too many examples inside a folder tends to create a character count that breaks it. Some people start splitting off subpages for popular tropes when the character count hits ~300,000.
Edited by Candi Coming back to where you started is not the same as never leaving. -Terry Pratchett

How long should a list of tropes be before it splits off into its own page?
I also wanted to know if this was where I should ask this question - the pages for each of the films in The Dark Knight Saga have their own subpages, but the page for the saga itself also has subpages. Should they be merged together?