Officially Nissan claims the CVT fluid never needs to be changed. so there is no mileage or time limit. I did change mine at 30,000 miles but I'm very cautious about maintenance. Expect the dealer to charge you $20/qt and the transmission takes 10 qts.
Also pls turn off CAPS LOCK - it makes it harder to read and some people use it to denote "shouting" which can be rude in the world netiquette.