according to my understanding,

回答: check out the grace peroidya_ya2005-01-11 12:18:25

grace period is a period for you to pack up and linger in U.S.legally even if your visa has expired, I have no idea of what it really is and how long it is, your question recalled me my friend's, as "我不是ya_ya" said, you should check out INS regulation or international office.
good luck

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