There really is no longer a "standard time" for a repair turn around. It depends on how busy they are, if the specific parts they need are in stock, (S&W outsources parts now days and they also have a Factory up in ME that needs to supply the Springfield Factory with parts for some models), how many workers are out on vacation, Covid leave, if the Factory had a scheduled shut down, and who scheduled your repair and to whom. Then of course you need to rely on the shipping dept. to not misplace it prior to being returned. Yes, that does happen and there are times a gun sits there for an extended time until someone inquires and they get it out the door.
So basically you will be at their mercy and all you can do is hope whatever they need to get your specific gun back to you is is stock and the repair guys are working regular shifts. Good luck and I hope they get yours done in a timely manner and get it right the first time.