I had them rebuild a turbo and it took over a month.
They actually rebuilt it twice. I picked it up on a Friday on my way home from work, ran home and bolted it on the car in hopes of making it to the track that night and it leaked more oil than it did before I took it there.
So, I took the turbo back and they shipped it to somewhere in KY to have it rebuilt, a month+ later I finally had a working turbo.
Had I known it was going to take that much time/effort I would have shipped it to PTE.
Don't take that as me saying anything bad about Columbus Diesel, just saying you'd probably have about the same turn around time as mailing it somewhere. Though, had they ordered the correct parts for my turbo the first time it would have been done in two weeks so who knows. I will say they stood behind their work and didn't give me any hassle when the turbo leaked the first time.