2 hours, 2 minutes, 2 seconds (Wind at Walden Pond, March 12, 2007),
44 fans, wood, computerized dimmer board
93 inches tall, 14 feet in diameter
I recorded the wind at Walden Pond using an anemometer and here re-created that wind, both its speed and direction, using a programmable dimmer.
The maximum wind speed was 8 mph and the prevailing wind was from the south and southwest.