They have 234 on the start list right now with a 7 AM start.
I think this is the first year I ever remember with more entries in the Maclay than the Medal final.
If you guesstimate it at two minutes a trip plus a few drag breaks, I don’t see how the first round could get done in much less than nine hours.
Then a flat phase. Then a second round over jumps. Then whatever test they might decide to do.
That sounds like a looonnnggg day.
Start list: