Japanese · Pronunciation Guide
ta-ku-sa-n, four beats — the ku usually whispers and the closing n is a beat of its own.
takusan
Four slots, of which one is whispered and one has no vowel at all. English hears three syllables here and delivers three beats; Japanese measures four. The two beats English tends to skip are precisely the ones with the least audible content.
Listen: たくさん
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昨日はたくさん食べました。
Kinou wa takusan tabemashita.
I ate a lot yesterday.
Listen: 昨日はたくさん食べました。
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昨日はたくさん食べました starts with 昨日 (ki-no-o), three morae with a long o at the end. So the sentence opens by asking you to hold a vowel and then immediately asks you to hold a nasal — two different kinds of extra duration, back to back, both of which English would compress.
"tak-SAHN" in two syllables is the usual reduction: the ku swallowed entirely and the nasal treated as a closing consonant. Both are morae. Keep the ku as a whispered but timed beat, and hum the final ん for its own full count. The word should feel noticeably longer than English intuition suggests.