Isn’t the earth 24,000 miles around at the equator or over 131 million feet?
Did you only count the 85,000 feet of altitude, and not all the way to the center of the earth In your equation?
hanging my head in shame.....yes....yes I did....sigh
so at sea level it would be ~7 hours......( 131M ft/5280 ft/sec)* 1 hr/3600 sec...