Korean · Pronunciation Guide
gong-hang. Two blocks that both end in a nasal ㅇ, with a ㅎ between them that weakens after the first one.
gonghang
Two beats. Both syllables end in the same nasal and neither releases, so the word has a symmetrical hum to it, and the only interruption is whatever survives of the h in the middle.
Listen: 공항
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공항까지 얼마나 걸려요?
Gonghangkkaji eolmana geollyeoyo?
How long does it take to the airport?
Listen: 공항까지 얼마나 걸려요?
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공항까지 얼마나 걸려요? attaches 까지, which already begins with a tensed consonant, so nothing further hardens. Then 걸려요 supplies a geminate l, and the question closes on a rise.
Leaking a g after either ㅇ is the recurring error, and here there are two chances to make it. The second issue is the ㅎ, which English speakers give full force, when between two nasal-heavy syllables it should be barely audible.