Foreign countries fly to and from China, and they have visas to transfer in Japan. I want to spend two weeks in Japan. Is that ok?

Hello, the transfer in Japan you described has a visa. Do you mean you have a Japanese visa? If you have a short-term visit visa to Japan (travel, business, visiting relatives, etc.). You can stay in Japan for less than 15 days, and it is no problem to play for two weeks. If you have a Japanese visa that is more than three years or more than five years, there is no problem. The stay period of these two visas is within 3 days. However, if you only have a transit visa or a third country visa (without a Japanese visa), you can't stay in Japan for that long. It should be noted that a single visa in Japan is valid for three months. If you have a visa now, please pay attention to whether the visa expires when you leave. If you don't have a visa in hand, it is recommended that you apply for it about one month before departure.