In reply to Xharlie:
Most VAG cars can be set to long life variable intervals or shorter mileage/time based intervals. The longer life one is designed for fleets/higher mileage users and involves better quality oil to allow for longer intervals, but also allows the longer interval as its aimed at higher mileage drivers, and higher mileages on average cause less wear than low mileage drivers who do lots of stop[ start/city stuff. In reality, its at least partly a tool to make sure that company buyers do virtually no servicing in the first 2 or 3 years before they flip the car on....
Seems likely its on 'variable service' schedule. That's based (in theory) on time elapsed and mileage/style of driving. So it counts down time (nearly 2 years normally) but adjusts for harder driving so it may request a service quicker. Nice long easy runs probably push the number of days back up as it assumes you are going to do easy long drives rather than stop/start/cold start city stuff.
The alternative is straight time/mileage based where its something like 'annual or 9,000 miles whichever comes first'.
Main thing is that having had car a few months, dealer should have serviced it and/or re-set the counter from where you collected the car as I would definitely not expect to be servicing a delivery mileage car a few months after buying it.