According to FEI Artcile 816:
“816.1.1 Horses and Athletes must, though not necessarily as a combination:
816.1.1.1 Successfully complete 2 rides of distances between 40-79 km and 2 rides of
between 80-90 km at speeds of 16 kph or under.
816.1.2 From their first novice qualification ride, horses must complete the
requirements of the qualification phase within 24 months. Horses are eligible
to compete in a CEI 1* event 12 months from the completion of the first novice
ride provided they have completed all the novice qualifications including
respecting speed and rest period restrictions. Once the novice qualifications are
fully completed, horses are eligible to compete in a CEI1* event for a 24 months
period.
For 8 years old Horses and older, dispensation of art. 816.1.2 and 816.1.3 can
be granted if athletes and Horses, not necessarily as a combination, have
accumulated a minimum of 240km in a maximum of three National Events in a
36 months period.”