
There's no expected sync time. For "force a sync", if you mean make the sync happen immediately, you can try to turn off and on Edge sync in your iOS device to see if it works.
If there's no error and the sync succeed, I think you don't have to worry about. If you still have concern about the long-time sync, you can provide feedback to Edge team by pressing Alt+Shift+I in Edge. Thank you for your understanding.
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Regards,
Yu Zhou