関連ワード:
how many years does it take to master something how long does it take to master something how long does it take to master something 10000 hours how long does it take to learn something how long does it take to learn something new how long does it take to learn something in school how long does it take to learn something off by heart how long does it take to learn something well how long does it take to master anything how long does it take you to master something
