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It should be right after someone submitted the form. 10 minutes is not normal, but I think we have to consider some few things why that happens. It's either an issue with our server taking the time to pass the data to Google Spreadsheet or it's an issue with Google Spreadsheet, probably they are updating something related to the API.
Well, you could try re-integrating the form to Google Spreadsheet. But please note that when doing so, there's no way you can select the same Google Spreadsheet. The integration will give you a new sheet/file.
When did you notice this? Is it doing the same most of the time or for new submissions? Please let us know.