Korean · Pronunciation Guide
da-sut, two beats. The second vowel is the unrounded ㅓ, and the word finishes on an unreleased stop.
daseot
Two even beats. In terms of timing the second syllable is cut short by the final stop, so the word feels front-loaded even though neither syllable is stressed -- the standard pattern for native numerals ending in a batchim.
Listen: 다섯
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사과 다섯 개를 샀어요.
Sagwa daseot gaereul sasseoyo.
I bought five apples.
Listen: 사과 다섯 개를 샀어요.
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사과 다섯 개를 샀어요 puts 다섯 directly before the counter 개, and the unreleased t tenses that ㄱ into ㄲ, giving da-seot-kkae. Tensing across a word boundary like this is fully regular, and native speakers do it without thinking about it.
The second vowel is where English speakers slip, reaching for 'daw' or 'doe' instead of the flat ㅓ. Unround completely: it is the vowel of 'cut' pushed back. The other habit to break is releasing that final t, which adds a phantom syllable and turns the numeral into 'da-suh-tuh'.