Thanks! That's awesome to hear! I think I may do it (someday)

Sandie needs to get in better shape first, she was SO out of shape when I got her, and that was only 4 months ago...she's come a long way with a regular workout schedule but still has a long way to go before we could do endurance!
How did you and your horse train for it? What sort of schedule/what did you do and for how long/how frequently? I want to build up slowly obviously since my horse is pretty out of shape, but I'm trying to get ideas for a workout schedule?
Can you tell me a little more about endurance? How long is the race, how often are the vet checks, what do they look for at the checks, etc?