How often do insights update?
Insights refresh regularly from Meta, so your numbers stay close to current throughout the day.
Why recent numbers can move
Figures for very recent days can still change after you first see them. Meta keeps finalizing results and attribution for a day or two after the fact, so today's numbers may adjust slightly as more data comes in. This is normal and happens across all ad tools.
Getting the latest
If you have just connected, or you want the most recent figures, you can trigger a fresh insights fetch. For reporting you can rely on, look at periods that are a few days old rather than the last few hours, since those numbers have settled.
In short, trust the trend more than the last hour, and give recent days a little time before drawing firm conclusions.