Well, Nissan says it's good for life. If you plan to have them do all the service and you're not keeping the car past the warranty period, then it's all their problem and no point even thinking about it really. Personally, I think that fluid should be swapped at least every 20-30k-ish depending on conditions. It's not that expensive to swap it (in per-mile terms over those change intervals), and it's good insurance for long-term trans health.
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