Hmmm
I ride pretty slowly.
I can do pretty well for the first 100 miles or so.
By 150 miles or so, the cumulative fatigue really starts adding up.
180 miles.. Whew.
And, then bumping it over 200, and I don't think there is much left in the tank. Just staying on the bike and keeping the pedals turning.
I agree, 235 miles in 16.5 hours sounds a bit short. But, it will depend a bit on whether you are riding with riding companions, or going solo. Draft line?
Breakdowns?
How fast do you typically ride a Century ride?
Take your 100 mile time. Multiply it by 2.35 (for 235 miles), and then add a couple of hours, and you might get close.