I can carry the nutrition I need and with frame and seat water bottles and a camelback someone could carry enough water and the needed electrolytes, sodium and potassium salts drink to do 100m or 200k without stopping to go for a PR….longer with being in great physical/mental condition and if needed a support team. That’s not my kind of ride though. Depending on heat/hills especially, I like a quick stop a few times at rest stops or having to at controls to stretch, self-massage and since I don’t carry enough water to refill my bottles and maybe grab a banana etc., take care of any physical irritations early before a problem occurs or a quick bathroom break. I’m mostly only a PR type with running and in my bicycling training.