One day short of 6 months. In other words, they must reside in their country of origin at least six months plus one day to retain their citizenship. There are acceptions to the rules for special circumstances however.
Citizens can legally stay forever.
As the Nigerian requires a visa to enter the US, he /she can stay as long as the visa is valid. If the nigerian has a green card, then he/she can live in the US for any period of time as it gives them the permanent resident status.
three months
to stay there legally, permenantly you have to pass a citizenship test
how long would you stay with us how long would you stay with us
Not legally.
There is no requirement for the witness to be a citizen. As long as they are legally an adult it is sufficient.
How long can you stay in the USA on a esta visa
As long as you pay taxes and still have "ties with US" as proof of your intention to return to US and to continue to be a US citizen, its not a problem if you stay outside US.
Yes, as long as they aren't being paid.
if he entered illegally, unfortunatly the awnser is no
On a B1 visa, you can typically stay in the US for up to 6 months.