I hate to sound like a broken record, but based on our experience in other cases of unidentified remains, a few months is not a long time at all. Really. Seriously.
There are thousands of sets of unidentified remains in this country. Namus lists just under 12,000 cases; experts estimate that no more than a quarter of cases are listed in Namus. Now that DNA is known to be an effective tool, every LE agency with an unidentified person in their cold cases is trying to get a profile.
Some states have their own certified labs that are capable of testing DNA for recent remains, but older remains often need additional techniques that only a handful of labs are equipped and certified to perform. Those techniques take longer, and sometimes the testing needs to be repeated several times before a valid sample is obtained. Most labs and agencies have made concerted efforts to train new people, get up to date equipment, and deal with the load, which has reduced the backlogs from years to months, but it still takes time.
Six or seven months sounds about right for getting non-prioritized results back from the FBI lab.