I-140 RFEs depend on your application, rather than wheather you
did concurrent filing or not. I have been on this board quite a
while now, and I have seen that RFEs are usually given for
company financials, job descriptions etc. RFEs are usually more
common in substitution labor cases, for example, as it is hard
to co-relate ones qualifications with the labor certification of
someone else. RFEs are also given for incomplete applications.
When you do concurrent filing, the BCIS gives a preliminary look
at your I-140 application while looking at your EAD or AP. The
EAD/AP is approved if there are no 'major' problems with your
I-140. If there are problems (for instance you forget to attach
the LC certificate) an RFE is issued immediately. Hence it may
'appear' that concurrent filings have more chance of RFE. On the
other hand, some BCIS officials may even approve the I-140 if
the application looks good at that point. Hence many I140D
applications see an approval in 2/3 weeks.
My point is that if your I-140 application is submitted with all the
necessary paperwork, it shouldnt matter if you do concurrent
filing or not.
As for the I-140D time, it really varies, I have seen ppl get
approved in 2 weeks to even over six months. My case was
an I140D and took 5 months to get approved.
All this stuff I have mentioned above is from posts on this
board and on other immigration related websites, so 'do
your own research' on this.
As for concurrent filing, as I said before, its a no brainer.
- Oz