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How long will it take for iphone4 to restore its factory settings? It has been spinning for hours.

15 minutes or so.

Tip: If it is a jailbroken mobile phone, it is likely that the recovery will not be successful and you need to go to the mobile phone shop for repair. Or connect to iTunes and click Summary-Restore. After the system is restored, don't choose to restore the backup, and don't log in to the original Apple ID, but set it as a new iphone, so that the data inside will be emptied.