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いつ出国する必要がありますか。
Enter the date and time you expect to clear immigration. The 240-hour figure is a simple +240 hours in China’s time. The 30-day figure follows the official FAQ method: from the day after entry, 30 calendar days. The stamp you are given is authoritative. This is not a ruling.
A 24-hour visa-free transit also exists at open ports for travellers of any nationality who stay in the restricted area of the port. A separate 144-hour Greater Bay Area arrangement has applied to some Hong Kong or Macau tour groups — confirm that with the agency. This calculator does not cover those cases.