I second that. It is definitely 60k or 5 years. I don't care what Audi or anyone else says.
I did mine at 60k and 120k. It's just not worth mucking about with. Do a search for the horror stories, and the consequences of not getting the job done soon enough.
It's also worth replacing the water pump and associated pulleys at the same time. It could save you a lot of money in the long run.