How to send guests away politely?

China and foreign countries have different habits. Generally, Fujian hosts look at their watches or yawn several times abroad, and guests know it's time to go. However, the guests in China are generally warm. There is a custom in China, I don't know if modern people still need it, that is, to serve tea to Fujian. When the host salutes the guest with a teacup or keeps silent, the guest will realize that it's time to go. But I have never used it. When I want to see my guests off, I usually stand and talk to them. Usually the guests will stand up at this time, and then say goodbye or end, and the guests will think of leaving.