This is a 24km loop with 3 huts and its highest point is Mt Holdsworth trig at 1470m. (https://www.doc.govt.nz/parks-and-recreation/places-to-go/wellington-kapiti/places/tararua-forest-park/things-to-do/tracks/mt-holdsworth-jumbo-circuit/#). We completed the loop in two days, with an overnight stay in a very full Powell Hut!