Mine started alerting me at about 800 miles. I was in Amsterdam. Drove down to Nurburg on a Friday and had the service performed in Euskirchen (about 45 minutes North of Nurburg), the following Monday. Turned out to be almost 1200 miles on the nose on service day.
I was a little worried, knowing one of the reasons they change the fluids is to remove fine metal particles that may be created in the first 1200 miles... I didn't want those 'lil babies causing "damage", but I didn't want to take it in too soon and have more of those babies born after the service. <---------No doubt just new m3 anxiety.
Oh, one of my cornering headlights was broken (not that I noticed), and they fixed that too. 5 Euros