We did 18.5 km loop starting at northern entrance and not doing the escarpment offshoots , nor the spots in to camp.
The trail was under tall old growth trees for the majority of the hike. It was lovely! We crossed several streams , two rivers & unknown number of creeks (dry and moist).
This is not a hike for people wanting flat walking surfaces or cell service or even terrain . There were several climbs and descents every hour. There were trees to climb over, go under or walk around (at least three/km of trail). The views were of mossy forest floors, ferns, old trees, plethora of fungi and tonnes of toads. Some were so small!!

We easily did this hike in two days -1 overnight. We are not fast walkers, but steady. We cooled off in the Brookes and rivers. The hardwood stands felt like the rainforest with the amount of humidity they gave off.

Overall, totally worth it, but not a walk in the park.