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@xavierdisley
It has to take longer than an hour - you complete the last lap and then your average speed is taken to work out the distance. Just like a CTT 12 or 24hr time trial.
I've said elsewhere that with his stated power of ~370w and a likely CdA of >0.23 he'll do in the region of 50-51km, but I doubt he'll go much over 51km. The slight altitude of the track is worth a few extra metres too (anything up to 800m, depends on other atmospherics).