In most cases, it takes seven years or more to become a licensed physical therapist. The first four years of training are completed at the undergraduate level in health, science or a related field. The next three years are towards a master's degree plus one year of studies in a doctorate degree program.n most cases, it takes seven years or more to become a licensed physical therapist. The first four years of training are completed at the undergraduate level in health, science or a related field. The next three years are towards a master's degree plus one year of studies in a doctorate degree program.