My timeline:
Eb3, priority date June 2002
RFE on 485 for self March 2005, spouse a couple of weeks later.
Replied to RFE beginning of May. Received notice on June 8 that our case was transferred to Cincinnati, Ohio
Made infopass appointment to visit Columbus and was told that Cincinnati was the office that received files from the service center and that Cincinnati would forward the files to Columbus.
Our case was initially filed with VSC in March, 2001 (EB2 and future-employment based, the petitioning company is located in NJ and we always work in California).
My in-laws have been issued visitor's visa on 28th at Chennai.
Some points:
* I have sent the sponsor documents.
* Advised them to take special care about arrangement and presentation of the papers
* I have sent two sets of originals/copies for them.
* Trained them on the possible questions and the answers.
*They are both around 70 years of age.
*This is their first interview and they have never visited any foreign country.
The questions they faced: