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> He advised her to enter China for only 24 to 144 hours, short enough, he said, to avoid visa scrutiny by authorities,

China used to have a 6-day visa-free program. Now it is extended to 240 hours (ten days) visa-free program. What visa scrutiny?

> and urged her to communicate exclusively via the Chinese version of WeChat, a platform heavily monitored by the CCP.

The other programs do not work. WeChat is required to make any payments in China.