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多謝多謝8老師的詳細解答！～ 還有一個問題：那I130交了之後I485大概什麽時候交？

-About 10 years later.

是等移民局通知嗎？

-Check the visa bulletin every month to see whether the priority date is current. If yes, file I-485. However, F4 category (US citizen sponsoring brother/sister) takes about 10 years for the PD to be current, so he needs to wait for a long time to file I-485.

還有他留學身份畢業後如果呆在美國，等排期的時候不是就黑了，那等排期到了對I485申請有影響嗎？

-As I responded above, he needs to have his own status for about 10 years to file I-485. Otherwise, he may have to leave US and wait in China.