Filed on April 2, 2012. Received RFE on May 26,2012 (Regular Quota)

Within how many days we should respond to RFE, I didn’t get any info from employer so far.

Are there any cases like attorneys only respond and applicants do not need to do anything?

Thanks a lot!

Typically RFEs should be responded within 60 days of its notice.

The persion who filed the petition should respond to RFE. If the petitioner needs any document from your side they'll contact you. Else, you don't have to do anything in this regard.

You may contact your employer/attorney to get info on your RFE details.