Please confirm the duration of stay for B-1 /B-2 visas for the United States, for citizens of Nigeria. I have an invitation for a conference.
The length of stay is decided by the CBP officer when you enter the United States. The maximum length of stay cannot exceed six months. But you might get lower length of stay depending on:
- Your remaining passport validity;
- Your answer to the question, "how long you intend to stay in United States?"
- Your resources (i.e. date of return ticket, financial means etc)
Also for visa individuals the length of stay could be extended once you're in the United States if there is chance in circumstances USCIS finds acceptable.