I'm now in the U.S. on a B1 visa, and the company I used to work for give me an offer to participate in a project, can I change to J1 visa to extend my status to work for them? Is there any requirement for me to change to J1? Someone said I need to have at least 5 years work experience in my home country to change to J1, which I don't have. But I cannot find any information about it. Thanks.