Mt Climie is North East of Upper Hutt - with a total elevation gain of 850m from start to finish it is one of the best 'hill' runs of the area. The views from the top is pretty spectacular.
I've run/jogged/growled to the top once - the return trip is about 16kms - the first 8km is straight up as you can see from the elevation chart below. Round trip took about 2hrs for me.
This run is also on Page 62 of Runners Guide to Wellington.
This is best done on a clear day as it can get pretty windy up at the tops. So a call will be made on the day based on weather etc.
Some of the 360 views at the top: