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Unfortunately, there isn’t a straightforward way to determine exactly when the data is ready via an API query in the GA4 API. As you’ve noticed, the data settling time can be quite inconsistent. This is due to various factors such as how long it takes for data to be processed and exported, which isn’t a fixed amount of time. While it’s true that the export to the BigQuery dataset usually signifies that the data is stable, this can sometimes take place after the API data becomes available. The timing can depend on the specific circumstances of your website’s traffic, the region you’re in, and Google’s internal processes. While minor adjustments can be made to the data a few days after they’re initially processed, these are typically not significant enough to impact overall analysis and decision making. So in some cases, it may be necessary to adjust the time when you pull the data to account for these factors.
