每个信用证有效期为装船后30天。
Each L/C shall remain in force till the 30th day after shipment.
youdao
赵：信用证有效期持续到持运期后15天。
The letter of credit is valid for 15 days after the shipment date.
信用证的有效期是多长时间？
What is the period of validity of the letter of credit?
这张信用证的有效期是多久？
What is the period of validity of this L/C?
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