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Ref: Forestdale, I assume.
There's no specific rule about it, basically when there are so many it becomes difficult to even scroll through. Folderizing trope list is technically never needed.
(While at it, I recommend reading Administrivia.Zero Context Example. The trope name is not a part of the example context, pretend it's just not visible, so all these "Heroes do this." or "Tries to invoke this." don't make sense both logically and grammatically.)
Edited by Amonimus TroperWall / WikiMagic CleanupSlightly piggybacking off of what Amonimus said, both of these tropes are zero context, as they don't explain the trope (who is Jake, and who/what is Dallas that makes them afraid of thunder). It would be best to either expand them or comment them out.
And no, there's not a hard rule for folderizing. Personally, I don't think you're there yet, but if the ZC Es are expanded, you might hit that point.
My Fanfiction.net Page My DeviantArt PageDually noted, I'll go back and make some corrections to clean the page up a little when I get the chance.
Basically what the title suggests. A trope page I've been running for my friend's webcomic has been growing quite nicely and it's starting to get a little long, at what point should I start putting them in alphabetized folders like some of the longer trope pages do?