The reason to learn makeup in Korea is the feeling you take home
The reason is getting ready in a new country and recognizing yourself. You practice a natural daily look on your own face, in English, and someone stops you when it is almost right but not yet yours. That correction is the reward. The class is private, about an hour, or about 40 minutes if you only want eyes and brows.
The feeling the paragraph is naming
The reason given is not a souvenir. It is the feeling of getting ready in a new country and recognizing yourself. You are still you in the mirror. The trip is what made the lesson possible, and the lesson is what you can still do after the day is over.
How the hour is actually spent
You practice a natural daily look on your own face, in English. The teacher stops you when it is almost right but not yet yours. That correction is the reward the paragraph names: the difference between a face that is close and a face that is yours, caught while the makeup is still on you.
How long that class is
The class is private. Plan on about an hour. If you only want eyes and brows, plan on about 40 minutes. Those are the two lengths this paragraph is tying to the same reward.