两次入境签证有效期一般为三至六个月，每次停留期为30天。
A double entry visa is valid for 3 to 6 months with duration of each stay 30 days.
停留期的计算，是以天为单位的，一般情况是从入境第二天开始。
Duration of stay after entry calculates by days. It usually starts to count from the second day of entry.
停留期的计算，是以天为单位的，一般情况是从入境第二天开始。
Duration of stay after entry calculates by days. It usually starts to count from the second day of entry.
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