I have done 2 test drives. One in Soushan Hill, I was not scheduled but met a fellow poster here and we went together letting me use his spot. It was 15-20 minutes and we got to travel around on the highway as well to really test out the speed. It was pretty exhilarating.
My second test drive was a normally scheduled drive in Cyberport. We stayed on the slow speed roads, it was about 10 minutes or less, just went around in basically a slow winding circle and came back. It was not as fun but still useful.