旅遊visa最長可以在美國逗留多久?

They can give you one month, mostly 6 month. you want to exten your stay, too much problem !!

1. within 90 days

2. A nonimmigrant temporarily enters the United States for a specific purpose such as business, study, or pleasure. When you entered the country as a nonimmigrant, a U.S. immigration inspector should have examined your passport and visa and then given you a Form I-94 (Arrival/Departure Record). This record should tell you (in the lower right-hand corner) when you must leave the United States. You can prove you did not violate U.S. laws by turning in your Form I-94 to the proper authorities when you leave the country. If you want to extend your stay in the United States, then you must ask for permission from the US Citizenship and Immigration Services (USCIS) before your authorized stay expires. Proof that you are willing to obey U.S. immigration laws will be important if you want to travel to the United States as an immigrant or nonimmigrant in the future. If you break immigration laws, you may also become subject to removal (deportation).

持有中國或香港passport, 美國旅遊visa最長可逗留90日

2006-11-23 13:36:24 補充：
可以在美國申請延期逗留..."The extension may granted or not granted depending upon the reason for extension, and whether the USCIS is conviced that the applicant does intend to return to his/her home country after the temporary stay in US."http://www.immihelp.com/visas/extend.html