Japanese · Pronunciation Guide
ge-n-ki, three beats — the nasal in the middle is a full beat, coloured by the k that follows.
genki
One of the three units has no vowel in it at all. The ん here is a good demonstration of assimilation: it takes its place of articulation from the k after it, so it sounds nothing like the ん at the end of さん. Its duration, though, is exactly the same — one beat.
Listen: 元気
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おかげさまで元気です。ありがとうございます。
Okagesama de genki desu. Arigatou gozaimasu.
I'm well, thank you.
Listen: おかげさまで元気です。ありがとうございます。
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おかげさまで元気です。ありがとうございます。 gives you ありがとうございます in the second sentence, ten morae with a long o inside it. Between the nasal beat of 元気 and the held vowel of ありがとう, the pair of sentences covers both of the main ways Japanese adds duration that English wouldn't count.
"GEN-kee" in two syllables is the near-universal version, with the n as a syllable-closing consonant and a long stressed first vowel. Hum the nasal for a full beat — and make it the "ng" variety, since a k follows — then keep the final i short. English speakers also over-lengthen that i because "key" is a long vowel in English.