The Clippers are attached to a 12volt Car Battery, so horse can be clipped anywhere without electricity.
Clipping time generally takes up to 1 hour. Problem horses takes a little longer. Some horses may need to be twitched, and others may need sedation, either by injection or you can use a paste which i have know to have a good affect on alot of horses. You would need to speak with your vet about this.
To summarize on why we clip horses, and the key benefits:
Faster Drying after exercise
Maintain better level of fitness
Conserve energy by reduced sweating
Easier grooming
Smarter Looking Horse