How long does it take for Qi Liu Hai to separate Liu Hai?

When you keep your bangs straight in the middle for a month and a half, comb your hair in the middle every day and blow it from the middle with a hair dryer. After a long time, it will naturally be divided, but it will take about 5 months to stay on the chin. Because hair grows about one centimeter a month on average? I hope this helps.