弟妹们能告诉我，离拿到绿卡还需多少时间？我有空卡，丢了工作是不是还能再呆在美国找工作？谢了！
Initial Review:
During this step, USCIS initiates the background checks of the applicant/petitioner and identifies issues that may need to be addressed either during an interview or by asking the applicant/petitioner to submit additional information or documentation. USCIS reviews applicant's/petitioner's criminal history, determines if there are national security concerns that need to be addressed, and reviews the application/petition for fraud indicators.