For those who can't get near a TV set or who live overseas, TVNZ advises their coverage will be live streamed via the internet.
The link is not yet up but will be in good time for the event.
Go to tvnz.co.nz and look for the link. When it is available I'll put it up here and bump this post to the top of the page.
For me, the fun starts at 4.30 pm when the polls close so I reckon it will be all over by 7.00 pm.