Your lawyer's experience is far different from mine. Working with CMS is one of the most time consuming and frustrating things our practice does when settling personal injury claims. They have strong statutory protection when it comes to recovering money from third party cases - they can collect from the lawyer and from the beneficiary - and as a result they do not hurry for any one or any reason. At least that has been my experience along with all of the other attorneys who I have discussed this issue with in Pennsylvania.
If your attorney can get this done in less than 3-6 months depending on the complexity of your case he is doing a great job.
For specific legal advice, an attorney needs to know the specific facts and circumstances of a case. This answer does not constitute legal advice nor does it form an attorney/client relationship.