You will be able to speak at your natural pace. You set aside 15 mins during the day to practice the metronome pace. The rest of the day you can speak normally. In the video, he also mentioned adding real-wold practice, so that would involve something practicing with metronome playing in one air and speaking with people. But you're not supposed to be doing this all the time. And you can stop after 8 weeks and keep the fluency.