Strange, my Chinese citizen wife got her conditional green card within ~6 months of application (about a year ago, we’ve been married less than 2 years and she took a few months to apply since her status wasn’t pressing). One thing they ask is if you are a member of the communist party (my wife never was), and I guess if the answer is yes things may be more complicated. I, myself, am a naturalized us citizen (from Eastern Europe, my dad got an E1 in 2001).