Don's turnaround time changes constantly depending on the number of camras that people have sent him for work at that moment.
Before you send him a camera, ask, by eMail, what his current turnaround time is. He will give you a candid answer and will meet his quoted schedule.
Accept the fact that he is at the top of his craft and you may have to wait, or, go somewhere else.
The one exception to this that I have experienced was a camera that I sent back for a warranty repair. Don evidently set this at the head of the line and it came back to me in ten days - my door to his door to my door.