Getting a massage is important to consider in your self care regimen. Everyday we use our bodies and overtime that can take a toll on our muscles and bodies.
Once a month should be sufficient to treating ourselves to a massage but it also depends on your level of pain or injury. In this case its best to speak with your therapist and come up with a treatment plan to better recover. Some cases may require twice a month in more chronic situations.
When it comes to massage frequency like anything else the more frequently you attend the sooner the results. Regular massage is important to prevent injury, pain and tension build up.
Because of this, it is suggested that you meet with the therapist as often as your health allows instead of waiting until you are in pain.