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@6pt
The route profile seems to have some beastly climbs between 100-140k, just when the fun begins to wear thin. That said, assuming the weather isn't too unpleasant, my inexperienced but eager self would aim for a mid 16 to mid 17 average, so probably 7 and a half hours with slave-driver sized breaks (I'm averaging 19-20 over flat-ish 40 milers atm, but haven't done anything longer than 60 miles for a long time, however summer was 5 hour 100s, 6 and a half hour 120s)