This depends if your horse is gelding, mare or stallion.
Geldings stay in quarentine for 3 days once they arrive to the USA. You cannot see them but their stay in quaretine is short. They stay in their box for the 3 days.
Mares and Stallions stay 3 days in quarentine and then need to go to special quarentine facilities where you can, walk, lounge and ride.
Mares stay around 15 days and stallions around 36 days.
Thank your for your question