Korean · Pronunciation Guide
jae-mi-it-tta. Four blocks, and the last two behave exactly as 있다 does on its own: a silent t and then a tensed ㄸ.
jaemiitda
Four beats, the third clipped by its closure. The word is 재미 plus 있다, and the compound seam is invisible: the two halves run together with no pause and no lengthening.
Listen: 재미있다
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이 영화가 정말 재미있어요.
I yeonghwaga jeongmal jaemiisseoyo.
This movie is really fun.
Listen: 이 영화가 정말 재미있어요.
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이 영화가 정말 재미있어요 releases the trapped ㅆ, which resyllabifies into the ending as a full double s: jae-mi-i-sseo-yo. Set that against the silent t of the dictionary form and you have the whole neutralization rule inside one word.
The temptation is to pronounce the ㅆ in the citation form, giving 'jae-mi-iss-da', when it is a silent stop. Then the ending needs tensing rather than a soft d. And with four syllables, English rhythm wants to stress one of them -- keep all four the same length.