The standard route is up Blueberry Ledge to the summit of Whiteface, across the Rollins Trail to the summit of Passaconway then down Dicey's Mill. Route starts and finishes at the parking lot. It is about 11 miles. (Ben Nephew did an extended route that he explains on the page for his FKT.) There is a Strava segment for the route.
I was thinking about going for this route and am a little confused as to whether the route is the one Ben followed originally? Or the one that seems to be used for the female FKT's?