Dave,
If you go US-50 E to I-81 S to I-66 E to Front Roil VA and get on the Skyline Drive in the south end of town and get off at US-33 W and back to Buckhannon and take SR-20 N to I-79 to US-50 and you stay somewhere around the speed limit it will take you about 9.25 hours to make the loop, and you’d cover about 410 miles...
The speed limit is only 35 on the Skyline Drive...
If you have the time to devote to this ride this would be an extremely beautiful and exciting ride...
If you elect to go on down to Roanoke VA the SLD will turn into the BRP just before you cross over I-64 and you will need to take SR-24 W to US-220 W to I-81 S to SR-311 NW to I-64 W to US-60 W to US-219 N back up to Elkins and US-33 W to SR-20 to I-79 N to US-50 and back to Buckhannon..
Now you’re talking about an IBR here, it may not have the miles but you’ll know you been there...
Time about 15.25
Miles about 625
Personally if I had the time and if it were me and I really wanted it see the SLD I’d opt for the first part I have in Red, and take a second day and do another good ride...
Day two, Hop on US-50 E to US-250 S and stay on it until you come to I-81 in VA, (I don’t like I-81 at all but it’s the fastest way to get down south) To I-64 W to US-60 at White Sulphur Springs and go West to US-219 N back up to US-50 W and back to Buckhannon...
This is about a 9.5 hour ride.
And about 480 miles...
I know these routes look like a long way but for you to see the maximum in the little time you have here there’s not too many other ways...
Even if all you did was take US-50 and ran over to Wenchester VA and back it will take you about 5.45 hours and the ride will be about 280 miles, but your smile will reach all the way back to Texas... When you ride US-50 it does need repair more so than most of our other roads... Be careful...
All of our twisties are long rides and not just a few miles long...
.