Japanese · Pronunciation Guide
i-tsu, two beats — one affricate, and a final u that usually whispers away.
itsu
Two short units, with the pitch high on the first. Even when the final vowel is whispered to nothing, the beat is still measured out — a native いつ sounds like a vowel followed by a puff of "ts," not like a single clipped syllable.
Listen: いつ
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いつ帰ってきますか。
Itsu kaette kimasu ka?
When are you coming back?
Listen: いつ帰ってきますか。
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
いつ帰ってきますか contains 帰って with its geminate: ka-e-t-te, four morae including a beat of held silence. So the sentence pairs an affricate at the start with a doubled consonant later — two different jobs for the same tongue position, and both take a full beat.
"EET-soo" splits the affricate and rounds the final vowel, and it stretches the opening i as well. Fuse the t and s into one release, spread the lips, and let the vowel devoice. Learners also tend to raise the pitch dramatically because it's a question word — the melody here falls, not rises.