What's the expected turn around of which-ever form for a suppressor using an outfit like Silencer Shop?
I'm still considering picking one up for my Ruger American Rimfire.
My 8 month approval was using Silencer Shop. Once you are set up with them, the fingerprints, photos, and paperwork are all done once and you don't do much of anything after that. Just set up a username on eForms to sign off on the forms electronically. Makes it real easy. I got an email from eForms with the tax stamp paperwork once it was approved.
As others said, it will take time, but don't wait to get the approval started. 22 LR suppressors are great fun. With a bolt action, you just hear the firing pin hit and the impact on the target. For me, standard velocity ammo generally stays subsonic.