Hi there, for an LTBV you only need to start a business, or revitalise an existing one, you do not have to employ anyone, though it helps, there is no set investment level in cash, only that you own at least 25% share in it and are involved in it's running.
You do need to be able to show that you are benefitting NZ in some way, and you still need to meet all the health/language/character requirements.
We have been in NZ for nearly 3 years now on a LTBV and are currently trying to get our residency.
Hope this helps.
Rob
http://www.immigration.govt.nz/migra...bv/default.htm