US visa valid period?

来源: 于 2007-03-15 20:51:04 [旧帖] [给我悄悄话] 本文已被阅读：次

I am H1B staying in Texas. Plan to attend a trade show in Italy in October. My questions are: 1. should I apply US re-entry visa in Mexico? 2. How long is the valid period for the visa? 3. Is it a multi re-entry visa? 4. If it is 2 entry visa, will it consume '1 entry' when I apply in Mexico and come back?
Waiting online. Thanks a lot.