Turnaround on repairs from Sigma

Any of y'all had repairs done on a lens from Sigma?  I'm looking for a guess on how long it takes them to turn around the fix.  I've got a lens that's developed a slight grinding noise when it focuses.  And focusing is slow and the motor seems to skip a little. 

I really like the lens though and want to stay with Sigma.  I've used it side by side with a Canon 28-70L and optically they are so close that I can't tell a difference.  Plus the Sigma seemed to be truer to actual color.  And I could almost buy 3 or the Sigmas for the cost of one Canon. 

Can't bash sigma. good company good camera's good glass.

I sold my sigma 18-200 when I bought the Nikkor 18-200 VR the VR is good and the lens is a little faster but the sigma focus was faster and the "feel" of the sigma I like better than either of the two Nikkor's I own.

It made it back today.  Turns out there wasn't anything wrong with it.  The focus ring slides forward and back to for auto focus / manual focus (in addition to the switch) and it had slide into the wrong position.  I took it out of the box and stuck it on a camera and it was still doing the same thing.  After sending a somewhat ugly email to Sigma which I wish I hadn't sent, I went a-Googling and found the "fix" to slide the ring back into the right position. 

Some of the Sigma's are really good on Nikons...what comes to mind are those fixed in the 30mm range (low aps). I have a 24-70 2.8 sigma that's excellent for macro work. I couldn't touch that focal length in Nikon. Just fwiw.
Paula