FINRA form and it’s timeline when joining a broker-dealer employer

Hi, I want to understand how long does FINRA form checks and completion takes? There is fingerprinting also needed with it. Doesn’t it pose impact/change in originally written joining date on offer letter? I have never done that hence don’t know. TC: $400k YOE: 12 #robinhoodcomp #robinhood #etrade #trading #tradingtech