Back on May 29, 2014 I did the Belknap range (all 12 summits) in 5:50. I ran it as a loop rather than a point to point.
Here is a link to it: www.strava.com/activities/146896115
Didn't really think it was FKT worthy until I came across this. Although, I suspect the time either has been or could be shaved significantly if approached as a FKT.