At sea level, the human voice will move at the speed of approx 1225 km per hour. In 1 minute, it should have moved 20.4 km. However, it will attenuate and be lost well before it reaches that distance.
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6 degrees
One minute or 60 seconds
In fifteen minutes the minute hand of a clock will move 90 degrees, or three hour labels.
90
The minute hand moves 360 degrees in 60 minutes so 6 degrees takes 1 minute.