You are right, four months seems too long. I don’t remember exactly how long it took in my case but I think it was several months.

In my husband’s case it took two to three months but six months later he got a frozen shoulder because the bubbles got to his joint. He got physical therapy and he dropped the sessions because he didn’t feel any improvement, then he was told about the bubbles traveling in the body. He started using his shoulder as much as possible and the problem was gone at about the year mark of his surgery.