It is about 97.5 miles. With your stated avg, I don't think you will make it in that time period...
Incidentally, Dennis Cove Rd is about 50 miles from Damascus. Some 'thru-hikers' decide this is a challenge and attempt it in one day ...
See you on the trail,
mt squid
PS. For future reference, all I am doing is substracting mileage from here (click on appropriate state for the .pdf).