The 144-hour period begins at 00:00 (midnight) on the day following your arrival. For example, if you arrive in Shanghai at 6:00 AM on June 1, the 144-hour count starts from 00:00 on June 2, allowing you to stay until 23:59 on June 7.

This means you may effectively have more than 144 hours to stay, depending on your arrival and departure times and your chosen mode of transport.

[Note: Some airports follow unique rules regarding when the 144-hour period begins—such as from the time of landing, from midnight, or from when the visa-free travel permit is issued. It's advisable to confirm the specific policy for your airport of entry in advance.]

If unforeseen circumstances, like flight cancellations, prevent your timely departure, you must apply for a visa at the local Municipal Public Security Bureau. To avoid complications, ensure you allow enough time for your departure.