Frequently Asked Questions - RFE
Request For Evidence is a a request from a government agency to provide further information on an issue before the government. Typical RFE's from USCIS question submissions for a specific petition or form such as I-140 RFE, I-485 RFE, I-130 RFE, H-1B RFE.
If the petition was filed under premium processing, the 15-day clock will restart when the response is received by USCIS. If the petition was filed under regular processing, it generally takes two to six months for USCIS to respond.