H1B visa stamp from Canada

I am a H1B visa holder and Canada PR. I plan to go back China in Christmas Holiday. I intend to apply H1B visa stamp in Canada before going back China. My questions are: 1) Is it risky? 2) Is the H visa has two times of entry to the US border? 3) Is the H1 visa valid for 3 months or six months? 4) Can I get the visa the same day or next day if approved?
Many thanks.

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回复:H1B visa stamp from Canada -StoneBrain- 给 StoneBrain 发送悄悄话 (437 bytes) () 09/13/2004 postreply 10:56:24

回复:H1B visa stamp from Canada -ambersdad- 给 ambersdad 发送悄悄话 (1738 bytes) () 09/13/2004 postreply 11:15:09

Someone gave you a wrong ... -CanImm- 给 CanImm 发送悄悄话 (79 bytes) () 09/13/2004 postreply 13:33:14

回复:Someone gave you a wrong .. -ambersdad- 给 ambersdad 发送悄悄话 (132 bytes) () 09/14/2004 postreply 08:10:06

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