How long should it take?

Most powder coating shops around here make their money off commercial orders that they bid on. That is their bread and butter, they take care of them first. I have been through this with my own stuff, you are not the only one. You just have to stay on them to get it done.
Kind of sad but its the truth. The shop will at least do the work I've requested even if they would rather do jobs they make big $ on. A couple years back I went to a machine shop to have lower control arm bushings done on and the shop manager turned down doing it for me so I went to a small shop in another town a little further away. That shop owner took care of me and now that I have valve issues and need head work.......That same guy who did my previous small job is doing the work.