As far as I know, ...1。签证有效期多久？我打算明年三月去美国开会，现在申请会不会太早？想尽早拿到签证好早订机票。
>>> 太早。不会给你签的。有效期取决于你的往返机票。
2。如果通过旅行社要比自己直接Walk-in多花多少钱？
>>> US大使馆不接受walk-in application。只能通过旅行社或者mail。 旅行社要贵50%的样子
3。如果自己Walk-in，需要预约时间吗？还是随便哪天去都可以？自己Walk-in跟旅行社相比有什么坏处？为什么这么多人选择多花钱的通过行社的方式呢？
>>> See above.
4。如果自己Walk-in，去银行买Cashier's Order需要手续费吗？
>>> See above. CO要手续费。
it's not early to apply now
the visa will be valid for a year. upon entering the US the officer will decide how long you are allowed to stay in the country.
and yes, you can do walk-in application, which does not require an appointment.
and yes, you can do walk-in application, which does not require an appointment.
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