I'd say half-an-hour still qualifies as a short. That's how long the Wallace and Gromits are (aside from Wererabbit, of course) and they still qualify for various "best short film" awards.
But if you want a new category for films like this, I'd pick "special". Although I think I'd also file the specials under the "short" categories at the same time, since dividing the two seems a trifle arbitary.
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