I do not have mileage listed for this map because it is a spiderweb of unofficial trails and your mileage may vary. This map is not for the weak among us and unless you know how to use GPS mapping tools fairly well I don't recommend it. This is a wilderness area that is very loosely maintained by the U.S. Forest Service, but most trails are kept up by locals who just love hiking there. Sarah and I hiked Linville Gorge in 2016 and managed to hike 22 miles in 4 days. That is not a lot. It is very rugged.
The map linked below is originally created by a community of locals on lgmaps.org and depending on when you read this you may want to go get their master map as it tends to change.