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请教：哪位老师晓得，拥有TN签证转申请绿卡需要多长时间？

-There is no difference between TN to green card and H-1 or other status to green card. It completely depends on what category of green card application you use (e.g. EB1, EB2, EB3, etc.).

您能推荐一下在这方面有经验的律师事务所吗？非常多谢！