period between two waiver applications

jula258

Registered Users (C)
From the web site (http://www.immigration.com/faq/jvisa.html#21) there is the information:

Q19 How often can I apply for a waiver?
A19 Every six months.


My questions:

1) Is there an official governmental link to this information? What does it mean by 6 months? between submission of two applications?

2) Is this period can be shorter if the applications on different ground?

I was not able to find this info on governmental web sites.
 
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