I am doing a hike tommorow from Massie's Gap in the Grayson Highlands. I would like to hike to the highest elevation of Mount Rogers. I believe you start out on the rhododendron trail and then intersect the AT and head from there to the top. Also I think there is a spur that circles to Wilburn Ridge and then back to the AT. Is this correct and how long will this hike take round trip.