How long before files uploaded to FTP are reflected in the Data Tables

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I am trying to use CPQ's standard functionality to store a file on an FTP server and upload it to a Data Tables.
When testing this function, we noticed that the time it took for the changes to be reflected in Data Tables varied.
At the earliest it takes about 10 minutes, but at the latest it can take 30 minutes or more.

So the question is, is this phenomenon
・Because this is a regularly scheduled import function, there may be discrepancies in the time it takes for the data to be reflected.
I believe this is the result of that, but is this correct?