From 2017 thru 2021 NFA applications more than doubled, the government is slow with anything regarding information. As there is no data available for 2022 to today. Biden has directed all agency dealing with firearms,mining,fossil fuels to slow or delay data/processing of applications. Just think how simple it would be if the government would process by IDENTIFICATION instead of date received.
It actually doesn't go by date, you can send in two different form 4s in together on the same day and its possible they could have different ATF inspectors, and be approved at very different dates, happens all the time.
Lots of them work from home, taking our unsecured private information with them to process. If your inspector has many in line in front of you, a good or bad work ethic, that can drastically change the waiting period.