Thanks for the info on the IBA. I have to confess I don’t know a whole lot about it, just that some friends have done the 24 hour / 1000 mile thing. They were the ones talking about riding while tired and foggy. I also read reports on perhaps the initial one back in the day? Somewhere in NZ I think. Or maybe it was just the first one in NZ. They were talking about riding unfamiliar mountainous roads at night in bad weather while feeling this numbness (in the brain, not the butt!). While there were no deaths it seemed like playing Russian Roulette to me. I had no idea people were doing 10k miles in 11 days. That’s insane.
I heartily agree with preparation and experience making distance riding easier, whether you are doing 1000 or 500 miles a day. I’ve only done about 400 so far so I have a ways to go but I got all kinds of weather that day, from 90’+ temps to freezing rain in the mountains. Thankfully I had the proper gear and I enjoyed both extremes.
As far as the liability with training goes, I do not feel qualified to be giving advice to anyone so I’m not worried on a personal level, but I will mention your concerns to those who organized this in case there is another one.