I believe it used to be 180 days for EB visas also, but USCIS has very cleverly removed that from the applications about a year ago due to the backlog. However it still applies for family based GCs. Some of the WOM cases being filed these days are from the family based category for violation of 180 day rule.
Not true either. Check my signature, my NC has been pending for over 40 months
Can you provide examples of such law suits? I've never seen such a rule ever. Even more than that, there is a lot of people in FB category, who wait much longer than a year (not to mention 180 days).
180-day rule is nothing else, but an urban legend.
Section 202 (8 U.S.C. § 1571) of the Title II of the American Competitiveness in Twenty-first Century Act of 2000 (AC21) clearly lays down the parameters of reasonableness in immigration adjudication, stating: “…It is the sense of Congress that the processing of an immigration benefit application should be completed not later than 180 days after the initial filing of the application.”
USCIS keeps saying that the period of time spent by "other agencies" for the completion of "background checks" doesn't count towards the time of consideration/adjustment.