I'm glad to know more about it. Bay did that, but he did it without me, so he knows more than I do about it ;~D. Do they mark them down by adding time penalties then? or is there a time plus a score element to it?
If you finished an hour ahead of every one else but came in with a lame horse who was bleeding from rough usage of the bit, etc. you'd be out of the running. If you came in later, in a heavy weight division, with a horse that was sound as a dollar, you would be rated higher than someone at the same time, in lesser condition.
Speaking of Bay, bet if you took him out on a course, he'd know exactly what to do. My old riding mare had run endurance before I got her. The one competive ride we went on, she automatically took the trails marked with the pink ribbon :) - she knew more than me.