The Monadnock-Sunapee Greenway Trail (MSGT) is a 48 mile long hiking trail that links Grand Monadnock with Mount Sunapee in southwestern New Hampshire. It winds along the Monadnock Highlands that divide the Connecticut and Merrimack River drainages. It is maintained by the Monadnock-Sunappe Greenway Trail Club.
Josh Ferenc & Greg Hammett ran the trail from north to south in 9h30m4s on May 10, 2008. Their trip is reported in the August issue of Trail Runner Magazine.
On May 2, 2002, Sue Johnston and Hans Put ran the trail in 13h5m. Though "not a super stellar time" (Johnston's words), this appears to be the women's FKT.
Here's a write-up on a 1-day run of the MSGT: http://selfinflictious.blogspot.com/2016/06/sunapee-monadnock-greenway-fire-and.html