"The director shall adjudicate the petition within 90 days of the date of the interview, unless the interview is waived in accordance with paragraph (b)(1) of this section."
If you had your 751 interview and are waiting more than 90 days for a decision, you have the makings of a strong Mandamus case to force the government to make a decision.
[link] [comments]
source https://www.reddit.com/r/immigration/comments/r7eh24/post_interview_delays_for_751_petitions/