i still dont see why you didnt have VW install the trans while they had it out
5.2 hrs for R&R clutch disc, 4.9 to R&I transmission, and it calls for 6.2hrs to R&R the ring gear (out of car) no specific times for diff, but you have to remove the diff to install the ring gear, so that is about right.
i dont care what some people say, no shop will charge you for how long it took them to do the job (unless it was a nightmare job, additionals such as bolts broken, rust, etc) they will charge book time. if it had come into my shop, it would have been about 11.5 hours in the estimate.