I'm talking about haircut, color and texture. I probably get a haircut every season, so that's about 4 times a year. I do try new hairstyling methods every month and this does not involve hair color changes. I love hair coloring but I think more than 3-4x a year might damage your hair especially if it involves bleaching. So, I can't imagine how K-pop stars put up with constant hairstyle changes such as digital perm and hair coloring.
On the other hand, Kylie Jenner had about 51 different hair looks within last year (2015). I also heard she has as closet of wigs.