Most notable was discussion of the current testing levels. Musk, asked about challenges, said that they are now at a level where interventions are rare enough that it’s hard to find new problems. It was stated that “we can go many days without getting a single intervention, so you can’t easily know if you are improving.”"Our cars are so good they don't have anything else to learn, and this is a problem."
While a precise number was not given, twice Musk suggested it was around 10,000 miles, the distance a typical car drives in a year. He worries that as they get to 20,000 and 30,000 it will take a long time with their Austin test fleet to get new issues to learn from.
If this were close to being true, in a way that normal people would understand it, then they would have achieved their goals.