Need to use it every day, massage for about half an hour each time, pay attention to the need to master a certain fingering, it is useless to press it blindly. As for how long it will take, it varies from person to person. Generally, the weight will be consolidated for a few days after it drops to the ideal value.
Finally, talk about the rebound. Losing weight doesn't mean you won't grow taller. Losing weight means a chance to start over. If you are slim, but you still live irregularly, overeat and eat until midnight, then your charming figure will soon disappear.