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Sounds like a real mixed bag of reasons from sickness, mechanical, lack of enjoyment or lack of progress.
I'm not sure how many people packed due to not making intermediate control timings. I know orgs can be quick flexible with these if you make the finish. Given how the quickly a lot of folks went from the start I think most of the DNFs were actually riders ahead of us within the first night and day.
What was that - were lots of people out of time?