What does 6 months per year mean?

hi234

Registered Users (C)
Hello all,

I have heard often that when a person gets a B2 visa even for 10 years, they are permitted at the most 6 months. Does this mean:
1. 6 mths per visit?
2. 6 mths total stay per calendar year?
3. 6 mths total stay in the trailing 12 months?

Or does it mean something else?

Thanks.
 
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