What an incredible experience this trip was, and our guides really made it for us by being so passionate about the job they were doing. We were so lucky on our trip and actually got to see 3 kiwi, one even walked right in front of us which was amazing and so special to see, especially in their natural habitat.
The whole trip is around 4 - 5 hours in total which includes a 1.5hr return boat trip and then a guided walk to spot the kiwi. I would advise wearing appropriate walking shoes and dressing warmly as you are walking on tracks/the beach for a few hours.
It's well worth the money and a must do if you're visiting Stewart Island!