Most likely a few frames, I'd expect it to vary randomly from one record start to the other.
This is VERY easy to test. Simply pop the Mavic up to 5 feet, turn it to face you, and start talking. Review video and note audio delay. Do it again and see if it is consistent. To increase precision, include a digital clock with hundredths of seconds counting - like the stopwatch on your cell phone. Viola.
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