No limit on distance. Difficulty should be rideable on a dual sport bike: gravel roads and double track. Nothing on private property or specifically off limits to motorcycles. In my experience, SC does not have the number or mileage of gravel roads that Ga and NC do, hence the interest.
Cheers to Adventure! Drinkin' upstream from the herd.
"It's never too late to do a bad job" Goethe
'74 R90/6, '01 R1150GS, '12 R1200GSA