Japanese · Pronunciation Guide
One short beat: "nee" clipped to half the length you'd expect, with the tongue flat against the palate.
ni
A one-mora word: about as short as Japanese gets. Its brevity is exactly what English speakers underestimate, because a single mora feels too fast to be a real word. When counting aloud, ni should be visibly shorter than ichi and san on either side of it — one count against their two.
Listen: 二
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兄弟が二人います。
Kyoudai ga futari imasu.
I have two brothers.
Listen: 兄弟が二人います。
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兄弟が二人います uses the counter form 二人, read futari rather than ni-nin — a reminder that Japanese numbers change shape depending on what they're counting. Within the sentence, 兄弟 opens with a long "kyoo" (two morae from one syllable), so you get a long vowel and a one-mora number in close succession.
The habitual English rendering is "knee" — a long, relaxed vowel taking a full English syllable's worth of time. That's roughly double the correct duration. Cut it in half, tense the vowel, and let the tongue lie flat against the palate rather than tapping the ridge. In counting sequences the giveaway is a ni that lasts as long as the san after it.