How long can Americans stay in China when they come to China with tourist visas?

Yes, your boyfriend can apply for a tourist visa ("L" visa) and issue it to foreigners who come to China for short-term sightseeing, visiting relatives or other private affairs. American citizens can apply for tourist visas once, twice, multiple times in half a year and multiple times a year as needed. Chinese Americans born in China (including Taiwan Province, Hongkong and Macau) can apply for a two-year multiple-entry visa. American spouses and children of China citizens can apply for two-year multiple-entry visas.