The average massage therapy session is 30 minutes to 1 hour long. But the therapist can make it shorter or longer, depending on what kind of massage you want and how long you want it. For example, if you want a deep tissue massage, it may be more than 1 hour. If you just want to relax, it may be only 30 minutes. It is best to talk with your massage therapist before the massage. This way you can figure out how long the massage should be.