Longer than most people hope, and there's no guaranteed window. AI models don't re-crawl and re-rank your page on a schedule the way a search engine does. What actually has to happen is that the sources they draw from — directories, review platforms, indexed web content — reflect your change, and then that propagates.
Realistically that's weeks, sometimes longer, not days. Anyone promising an instant before-and-after is overpromising. This is why we measure over time instead of selling a one-shot "fix and you're visible" story — the honest read only shows up across repeated scans.