I came across this well-made Mavic review in Chinese, and here are their real-world test results for flight time and radio transmission distance:
Flight time (3'10" in video): Orbit mode at 10m radius and 10m altitude in medium wind: 8% battery left after 24 minutes, and battery completely drained after 26 minutes. Repeated tests show similar results (25-26 minutes)
Transmission distance (4'25" in video): Weak transmission signal warning at 6km (3.7mi), however "no hiccups in video feed were observed". Continued to 7km (4.3mi) without problems, and the tester decided to bring the Mavic back due to battery level concerns.