I believe that anyone needs to work up to all day riding. That is the advice I give anyone planning their first road trip.
As we all know, the stock seat is great for 20 miles at a time and maybe more for some riders, but most people who ride distance on any motorcycle customize or change out the seat.
I did a 400 mile ride on the OEM RGU seat. One time. That is when I knew I needed a different seat. The OEM seat on the Special only got ridden the 30 miles home from the dealer and now hangs on the wall for when I part with the bike.
It is really the suspension on these adventure bikes that make them special. Especially the ones with electronically adjustable suspension systems. In comfort mode they just soak up the bumps, but in that mode the bike would wallow while aggressively taking the curves. Hit a button and put the bike into sport mode and fly through the curves and then put back into comfort mode.
It doesn't sound like Harley is putting electronically adjustable suspension, so most people find the best compromise setting and make manual adjustments if they anticipate a certain type of riding surface for the day.
I have no interest in going back to liquid cooled bikes for the time being. This might be my next adventure bike if I even get another bike before I retire.
2021 Moto Guzzi V85TT 100th Anniversary. Celebrating 100 years of continuous production in the same factory in Italy. With full aluminum luggage it runs about $13,000.