Japanese · Pronunciation Guide
a-i-da, three beats — the opening two vowels are separate, not the diphthong of English "eye."
aida
Three slots, evenly cut, with the crest on the middle one. Two of the three beats are bare vowels, which gives the word almost nothing consonantal to hang on; the timing has to come from articulating each vowel to full length.
Listen: 間
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会議の間、静かにお願いします。
Kaigi no aida, shizuka ni onegai shimasu.
Please be quiet during the meeting.
Listen: 会議の間、静かにお願いします。
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会議の間、静かにお願いします uses the word inside a longer phrase, and 静かに just after it has a shi that can devoice between voiceless sounds. So the sentence gives you a fully-voiced vowel cluster followed almost immediately by a whispered mora — two very different textures, same timing.
"EYE-da" is what emerges: the first two morae crushed into an English diphthong with stress on it, leaving two beats instead of three. Give the a and the i separate pulses. Learners also tend to make the d too forceful — it belongs on the teeth, released quietly, not on the ridge with a puff.