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New Zealand Immigration provides a Check my visa conditions online tool which you can use.
You can check the visa conditions that you need to comply with during the duration of your visa online or inside your passport.
You say you have looked at "online options", but I don't see anywhere on the above page that says you can't use it to check for the conditions of an ordinary visitor visa.
One of the required details is visa start date. For an electronic visa, that would be the date you entered New Zealand. If you don't know what date that was, then call your airline.