Long 7 Sisters 22 (MA)
Ben Nephew posted the route:
This is a 22 mile out and back on one of the most difficult sections of trail in New England. If the entire 114 mile Metacomet Monadnock trail is too long, but the 12 mile 7 Sisters trail race is too short, then you can connect sections 7 and 8 of the MM for a challenging 22 mile.