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I suspect that you started your 24 hr at very much the pace that I would set out at for a 10 mile TT though :-)
I have no problem at all with the guys that head out fast on longish audaxes, I think long bike rides like that are a chance to discover something about your ability, but also about your mental state, preparedness etc.
I think that the variety of people and approaches is one of the things that is appealing about Audax. A chap in sandals was at the halfway point ahead of me on the 400
I see that all the time. At the 24hr Worlds everyone rode off like it was a 100mi. I was last... for about 6 hours.