Extension of stay?
Answer:
It all depends on your circumstances. You should contact Citizenship and Immigration Services. There are alot of factors that go into a B1 visa. Don't wait until the last minute.
I don't know, but these folks will..
USCIS.GOV
I suspect it will depend on your circumstances, how long you want to stay, etc.
The immigration information post by website user , MyTend.com not guarantee correctness
