From an electoral administrative perspective, no. From the perspective of the formation of government, it took something like two months to form the first government in 1996. There was a lengthy coalition negotiation to establish the first MMP government. Since then governments have formed very quickly.
In relation to the way the New Zealand system works, I should just say that by 10:30 on election night, parties and the public are usually in a position to know the result of the election, and government formation negotiations can begin at that point.