I had posted this a few months ago:
I field for ROC (I-751) in February 2019 and for N400 in June 2020. I received a notice back in July 2021 for N400 interview, but never received an interview notice for the I-751. Our N400 interview was Friday, September 10 and the officer adjudicated the i-751 at the same time in a combo interview - we went prepared for a combo interview. Both approved, and since Newark, NJ does same day Oath Ceremony, the Certificate of Naturalization was issued on the same day. The i-751 portion took about 5 mins: we were not separated and the officer asked the following in the following order:
* to the US citizen spouse: what is your spouse's full name and date of birth?
when did you get married?
how did you meet your spouse?
* to the applicant: what is your spouse's full name and date of birth?
We took a lot of additional evidence but was never asked to produce any of it. We believe that it is probably because when giving the officer the original documents (birth certificates, green card, marriage certificate, first child's birth certificate etc), we also handed him the hospital birth records for the birth of our second child less than a month ago.
The N400 portion was about 15 mins, and straightforward: the 50 Yes/No questions that are in the application, 6 civics questions and confirming/signing of documents.
Good luck to all! See timeline in signature below for details.