I checked it last night on Google Maps. The distance from Dana's to Left Fork Rd is about 8.2 miles, estimated time was about 13 minutes. JMO, that's probably a guess for Google Maps. In reality, it probably does take about 20 minutes, especially at night, with all the curves, etc.
www.google.com
ETA: Watching those spooky security cam videos last night of the Wagners driving back and forth on Hwy 722 and Union Hill Rd and Left Fork Rd was eerie and frightening. So much evil creeping around that night. Its enough to give you nightmares.