RFE Received...!

My details..EB3 India PD Jun25 1999, ND Mar 27 2000, FP Mar 22 2001.EAD applied on Mar 15 2001, EAD recieved on Apr 20 2001 RFE issued April 30 2001. Also sent the change of address first week of Mar\'01.
The RFE is for the employment letter in company letterhead indicating remuneration, continued interest to hire, job duties etc. My priority dates are not current yet. Would INS approve when PD is not current ?
 
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How much time does one generally get to reply to a RE? Is it different for each case?

Thanks...
 
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