RFE for GCs have a 12 week response time window (84 days) . for the 60 days grace (https://www.uscis.gov/news/alerts/us...ncy-requests-3) try to avoid using that as they can change the rule and also the wording is "USCIS will consider a response to the above requests and notices received within 60 calendar days after the response due date set in the request or notice before taking any action. " . When the say consider , is it a guarantee ? I guess they will give you the 60 days but keep an eye if they withdraw that rule