5 months and 1 week, with two weeks in there because i had a small typo. Just got approved Feb. 5th.
8 months wait time, there is definitely something wrong. Call NFA Branch, and they should talk to you about it. Unless your dealer or transfer-er did not circle the box that allows you to be kept in the loop, on the Form 4.
First call should be to dealer/tranfer-er; if they dont know whats going on or they arent sitting on your paperwork, i would then call NFA.
Be polite, courteous, and have your serial number ready to give to the operator.