When can a H1-B FY2009 VISA holder Enter US after stamping?

The earliest is 10 days before the start date of the petition, so 10 days before October 1.

so if the person wants to come in earlier, he/she has to applied for B1/2?? Hemm, how will that work out? I mean my friend wants to travel around before being tied down to the job permanently =/

Any suggestion? Thank you
 
H1B is a work visa, for travel you need B1/2. You can either apply for COS to H1 or leave and re-enter on H1.
 
If you want to enter US earlier than 10 days then you have to apply for B-1 visa. During entry to the US on B-1, the I-94 validity will be up-to the duration of the visa. However, you cannot work using that visa. To change status to H-1, you have to travel abroad and get the H-1B stamped (skip this step if already stamped) and get a new I-94 (during re-entry) based on H visa stamp.
 
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