Q: Submitted RFE no response from USCIS

I passed the initial naturalization interview last April 26 2017. The USCIS officer failed to send me an RFE letter for that is why I personally handed over my case dispostion documents last August 17. These closed cases are from more than a decade ago. I have not received an update on my case. How long does USCIS usually respond or make a decision to after submitting an RFE? How can I be sure if they are going to approve or deny my Naturalization Application?

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