I have no affiliation with the NERCA group that ran this trip but have set up other trips in my area being a member of the national group and a certified excursion coordinator.
This was a three day trip in total.
Believe it or not on most trips, car speed averages 10mph. This is with slow orders, stops for lunch, bathroom, breakdowns, crossings, etc. On a good day you might get to 15mph average.
Seton and setoff averages between 5-10 minutes per car.
A 100-120 mile round trip in one day is about the limit you can do with speeders. Since they had to portage from one set on to another prior to the second day I am sure the decision was made to keep the first day short to accommodate everyone.
Hotel availability, set on location, parking for 35 trucks with trailers, food, etc. and many other aspects come into play.
The second / third days of the trip included an overnight at the farthest point from the set on.
310 miles total for the trip. That was a big one.
CV the Civil E