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this is one of the most popular hiking trails in NZ, the Routeburn.
Some trailrunners sprint the whole trail in a day, for normal people though takes a couple days.
Unfortunately cuz of it's popularity you usually need to book the huts a few months in advance.
But there are like 960 something huts dotted around the country with trails going every which way, so there are plenty that go unvisited for months at a time.