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請問8老師， 父母辦綠卡的那個無犯罪證明， 因為隻證明無犯罪紀錄到辦證的那一天， 那需要來美國之前多久辦？
-The later the better. But they don't need to provide this document for I-485 unless their fingerprinting fails.

多少時間有效？
-No time limit because it is  just the proof  for the period of time their stay in China. If they return to China and stay there for more than 6 months before their file I-485, they need to get a  new one again.

謝謝！