Leica NJ took eight months to turn the one repair I've sent to them around. After three months they sent the item back without fixing the issue. To their credit, when I called them about it they were quite gracious about getting my lens back to set things aright. However it then sat on a shelf for a month before anyone bothered to look at it and realized that they needed to send it to Germany (since NJ lack experience with the Tri-Elmar).
They do have a new customer service manager, so perhaps things are better now. I hope so.
My one experience with Don Goldberg was just the opposite. I might have caught him during a non-busy period, but he turned a CLA around in fewer than three weeks, door to door. In fact he asked if I needed the camera back by any special time when taking the order and beat my time frame by three days.