I guess it depends on what type of skincare they are doing. My ex (Korean), had a 7 or 8 step routine each night. This is fairly normal for young women in Korea.

She explained it to me as such: it wasn't so much an anti-aging regime, as a protection from the elements regime -- in particular pollution, as South Korea has some trouble with seasonal fine dust. I suppose it makes sense. And for what its worth, her skin did have a healthy, shiny, glow after applying all the layers -- which is also part of the appeal.