Hindi · Pronunciation Guide
duss, with a short schwa — and the d is dental, made against the teeth rather than the ridge.
das
A light-vowelled monosyllable closed by a consonant, so it is heavy by position but short in actual duration; among the numerals it is one of the briefest words, which is exactly why learners tend to over-lengthen it to match the surrounding long-vowel numbers.
Listen: दस
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दस मिनट इंतज़ार कीजिए।
Das minaṭ intazaar keejiye.
Wait ten minutes.
Listen: दस मिनट इंतज़ार कीजिए।
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"Das minaṭ intazaar keejiye" keeps minaṭ singular after the numeral, which is standard for measure nouns, and minaṭ ends with a retroflex ट even though it is an English loan. Intazaar has a nuqta ज़, so that consonant is z, not j.
Two substitutions creep in: an English alveolar d, and a full "ah" vowel giving "dahs." The Hindi word is dental and schwa-based, closer to the unstressed second syllable of English "Thomas" with a d in front. Get the tongue on the teeth and keep the vowel colourless.