5. Cancel. The time it takes to become a message therapist varies, but at least 500 hours are required from most massage schools and a National Certification exam is necessary. Become a trained and licensed massage therapist with advice from an experienced massage therapist in this free video on massage.o depending on the amount of hours required in your school and how long that is to start, depends on how long your final path is, how long your path is taking you to become a massage therapist. Now massage therapy school is great.