This is the historic Packhorse hut, which my partner and I walked to this afternoon. It took us about 2 hours to get up to the top. It’s quite steep in places, but is generally a slow gradual climb. If you are not stopping to take photos all the time you could probably do it much faster. The track starts at Gebbies Pass and is very well marked. I highly recommend it as a nice half day walk, and it’s only 40 minutes from Christchurch city.