Y!!! Appalachian Trail PA Section FKT attempt.Planning. Spreadsheets. Daydreams. Date is flexible (Apr/May), bug-, daylight- & weather- (heat & storm) dependent.
Karel Sabbe did it Supported in 4 days, 4 hours 34 minutes (pace avg 26m:15s/mi).
There's now also an official FKT for the section, Unsupported in 5d 13h 39m (pace avg 35m:00s/mi). Doable.