Japanese · Pronunciation Guide
ku-u-ko-o, four beats — two long vowels back to back, and neither u is rounded.
kuukou
Four beats built from two long vowels and nothing else. It's an unusually pure length exercise: the consonants are identical, so any unevenness in the word is purely a duration error. Both halves should take exactly the same time.
Listen: 空港
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空港までタクシーで行きます。
Kuukou made takushii de ikimasu.
I am going to the airport by taxi.
Listen: 空港までタクシーで行きます。
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空港までタクシーで行きます contains タクシー (ta-ku-shi-i), four morae with a devoicing-prone ku and a long final i. So the sentence has three long vowels in its first two content words, which together account for most of its duration.
"KOO-ko" halves the word: the first vowel rounded and shortened, the second shortened too. Spread the lips for the u, hold both vowels for two counts each, and keep the volume level — English speakers convert length into stress almost automatically.