This is a tricky one! If the business is doing well and employing NZers, you could look at an Entrepreneur Visa maybe, but this won't help right now. LTBV can take a long time but if I were you I would contact the Business Migration Branch of INZ. Phone 0508 558 855 Fax +64 4 801 2928
If your business fits the requirements of an LTBV or Entrepreneur Visa they should be able to give you an idea of how long the visa processing will take. If all else fails, you might have to put in a NZer as manager until it is all sorted. I hope this helps. If I can be of further assistance, please send me a Private Message as I am currently in NZ and so don't have such easy access to the internet. Hope it goes well! Karen