No , racecourses are all different sizes, with various race distances available within them. A flat racecourse from 5 furlongs to 2 miles (approx) or a jumping course from 2 miles to 4 and a half miles (approx).
1 mile
3/4 of a mile on a mile track
Fastest mile long track is Phoenix International Raceway (PIR)
One mile.
They vary in length, but as your question is posted in the KY Derby category I will say one and one quarter miles since the Derby is held at Churchill Downs and that is the length of that particular course.
A full running track is a mile long.
A half-mile track is only 4 furlongs, so the 5 furlong track is longer.
4.264 furlongs
There are many lengths, not all are the same. Some are a half mile, one mile and some are 2 miles.
Only One.
The average is 1 mile.
If the track is a quarter mile long, 2 and a 1/2 miles