Sorry, that was rhetorical. I am well aware.
I spent the previous weekend grooming and coaching one horse and rider pair at a one day event and was exhausted from all the walking and horse care.
Now, I am old and not a professional groom. I need to work on my stud technique, because it takes me forever to put studs in/take studs out on one horse.
I also think riding an advanced XC 7 times in one day, or as I see from the schedule at Terra Nova, they split the FEI and National levels up, so a rider might have 4 XC rounds and 3 SJ on Saturday, and 3 XC rounds on 4 SJ on Sunday. That is in no way analogous to even the hardest working H/J pro.
I am in awe of the skills and organization it takes to compete that many horses, at that level, in a single weekend.