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如果我理解的對， 是說如果我先生六月入境美國，他必須在七月十七號離境。除非，他在我收到H1B後，在美境內申請H4延期。

不知再美境內申請延期要多長時間。

-Your spouse can apply for the H-4 status extension (file I-539) immediately after he enters US using the H-4 visa even if your H-1 extension is pending. He just needs to provide the copy of your current H-1 approval notice with I-94,  the copy of your H-1 extension Receipt Notice, the copy of your marriage certificate (may also the paycheck stubs of your latest three months). 

His H-4 extension application only can be approved after your H-1 extension is approved and his new H-4 status duration is the same as your new H-1 status duration.

謝謝幫助！