I found your site is very helpful to know the US immigration. I would like to ask few queries about Immigration. I have just got notice the petition has been approved as relationship of sister. My Brother is living in US, He is US citizenship card holder. My query is how many years or months should I wait for the Interview of VISA.. Does it take long time or now it is very short? I tried to search in different site but I didn't get my answers. As my understand this is in F4 categories. I am from Nepal. I would be very glad if you provide about my answer of question.
Wait times are governed by priority date. Read the visa bulletin: http://www.immigration.com/visa-bulletin