The first 2-3 hours of the hike are incredibly beautiful and entertaining. One of the most enjoyable walk I have ever done. Going through small rivers, going under/over trees, onto rocks using your hands to climb a meter, going through rainforest or next to the ice blue river.
I would recommend it as a day trip, walking 3 hours and then 3 hours back, for those who don't have the time to take 2 days or don't want to sleep in a hut.
The track is beautiful and the hot pool at the Hut are amazing !