[inferiorhuman]

How does Korea have 15 minute tests

They don't. The drive through stations send samples off to a lab that uses a 5–6 hour process. If memory serves, a Hong Kong company devised a 45 minute test otherwise in most places you're looking at hours not minutes.

https://www.bbc.com/news/world-asia-51836898

[cjhopman]

You're right. I swear I saw some article that said that South Korean drive through would text results as fast as 15 minutes, but looking at a couple more reports just now all said 24 hours.