Built for the Japan Racing Association (JRA) by Mitsubishi Electric, the screen measures 11.2 meters (37 feet) x 66.4 meters (218 feet), is about 4 stories high and has a surface area of 744 square meters (8,000 square feet)
In this video, a Fuji TV news reporter runs from one edge of the screen to the opposite end in about 13 seconds:
Link
A bit out of my budget at the moment :-)