Sorry to hear you are having light strike problems. Before sending it back, check and make sure your strain screw hasn't backed out a bit first. They can do that on you and will cause light strikes. If you don't know where the strain screw is, it is on the lower part of the frame in the grip area on the side of the trigger. I don't know what stocks you have on the gun, so you might have to remove them to have access to the strain screw.
As to turnaround time for an issue like this, I can't help you as I haven't had to send any of my Smiths in for warranty work. I did send my old 27-2 back to the mothership over a year ago to get tuned up and it took about 8 weeks to get it done, but they had to check it out, get back in touch with me to tell me what needed fixing and I had to send them payment. That old gun is over 40 years old and isn't covered under any warranty.