You should wear it for at least 45 mins the first time and then check your measurements everyday for three days. I usually saw results within those three days
It is a one time use. I was told you can wear one 45 minutes or up to 24 hours, I used saran wrap to keep it in place... You shouldn't use more than one every 3 days and after you use it you need to drink a lot of water and limit your salt intake.