WIll everybody get checked overseas or just

some of them? I heard somebody passed their NC in a couple of monthes. Also If FBI checks 13,0000 people per year, does it mean that lots of people's name are waiting in line in FBI to get checked in turn? In another word, once after getting names from USCIS, will FBI check it right away or put the names in lines for a while and checks it after the names in front them are checked?