Mine took 17 days from when it left to when I got it back. I didn't think that was too bad.
BTW, it said nothing about what they did on the work order. I had to call to find out.
Mine was sent in for an OOB firing, and multiple FTE, and FTF, (brand new gun). The said they installed upgraded springs, and tuned the ejector.
I just received it last week, and got to the range yesterday. Fires perfect. 200 rds....no issues.