I-140 : RFE FROM INS : Signed copy of original LC forms

[vks]

Hi :

I had got my LC-EB3 in 1998, but filled for I-140 in
August 2001.

In December 2001, INS asked my attorney to submit

1) RFE - which was basically ETA-750B , that I had
filled during my LC.

Queries :

1) Any idea how much time such cases take ?

2) Can I file for an LC in another category, even after
filling I-140 under EB-3 ?

Thanx