It depends on how fast the horse is going, and what kind of horse it is. Most horses run about 40 mph. Speed*Distance=Time, so about 5 minutes, give or take some seconds.
About 30 minutes to 60 minutes.
That all depends on the exercise.
The number of times a day you exercise a horse will vary according to the horses level of fitness, it's lifestyle, your schedule, and if you board the horse, the farms schedule. A horse typically needs 45 minutes to one hour a day of concentrated exercise where it is worked in a frame and asked to collect and extend itself. The horse should also be worked on suppling during the workout. You can do one long workout or break it into two smaller workouts if you prefer.
8 minutes
well you should at least get 60 minutes of exercise daily.
12-foot x 12-foot
It will depend on the intensity of your performance and the type of exercise you do.
Jude ran 500 yards in 2 minutes how much is this in feet per second?
120 (2 hours)
1000 yards - or just over 17 miles per hour.
3520 yards ! The time is irrelevant.
about 30 minutes per day