免签过境的有效期至多为120小时（即5天），且不得延长。
Transit Pass facility cannot exceed more than 120 hours (5 days), there will be no extensionof this facility.
符合哪些条件的外国人可以申请在北京、上海口岸72小时免签过境？
What requirements foreign nationals have to meet to apply for the 72-hour transit visa exemption at ports of entry in Beijing and Shanghai?
当事人再次通过航空公司申请72小时免签过境时，边检机关有权拒绝其申请。
The border control authorities are entitled to deny his or her application for the 72-hour transit visa exemption via an airline company the next time because of such a breach.
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