Hi Sanvitto,
Have you been allocated a Case Officer yet? If so it might be an idea to drop him/her an email to ask how things are progressing. If you haven't, it certainly wouldn't hurt to contact NZIS just to confirm that they have received your ITA, seeing as you haven't had any acknowledgement (although I'm not sure if you would expect to anyway). At least you'd know it was safely in their hands.
I know there can often be quite a long wait and it depends on how busy they are at the time and whether there's anything they're waiting to come back from other people if they're checking out all your quals etc. If you have a job offer things generally move along faster than if you don't, so it's not unusual to have this wait, unfortunately.
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Mother Bear 
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