a well spread out, but still within the same 24hrs, same kit and without sleep, was a night ride and return totalling 167 miles...very weary at end but never been sure if that was the riding or the interminable Davy toilet breaks

Nah Teef and Davy were great and it was an interesting experience....still not sure if I want to go further, or as far, again.
also done a few rides from 90ish to 140ish miles - but even with the flesh willing I don't know if I have the mental tolerance/inclination to aim for a 250 or 300 in a day. I don't doubt I can do it just not sure I want to put myself through it. Still, never say never, as circumstances and fitness levels alter I may feel differently.