5.56, 6.8, 300 WM.
I purchased it last January and got my stamp in June, so about 6 months. I just got a form 1 stamp back a couple days ago for a .22 can build - it took about 8 months. I also have a pistol can in ATF jail, 8 months and counting.
I'm hoping the Hearing Protection Act gets passed this year and puts an end to the ATF obstacle course.