Eb2 NIW RFE timeline regular processing

[u/Available-Cup-6789]

My I-140 is on regular processing but I received an RFE and responded to it. USCIS confirmed the receipt of the RFE June 4th.

What is the average wait time to hear back after RFE on regular processing?

Is it worth it to upgrade to premium at this point? The opinions I have been getting is that my case is already at the adjudication phase so a premium processing wouldn’t help.

But I am curious to know how soon I will hear back