Is there anyone who applied for F2B in September 2015 and has been interviewed?

Yes. The F2B interview is conducted according to the order in which you submit the information. The F2B submission time is September 22, 2015. F2B is a category of relative immigration, which refers to over-age unmarried children applying for a US green card. The current waiting time is more than 5 years. Some people with good academic qualifications and good credit scores will be given priority for interviews, and some people will wait for about 6 years before they get the opportunity to be interviewed.