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Will it matter how often B2 visa holder travel to USA and how long she stay in USA and in China? For example, she stayed in USA for 6 months, and go back to China for 3 months, and then come to USA for another 6 months?
-Fine for one time, but you can not do that regularly because the I-94 duration may not be 6 months, but only 6 days if you go back and forth between China and US too often.