Consulting professionals, how long does it take to sign a doctoral visa in the United States? Is there a rule for how long the visa is valid when phd drops out of school?

Study is a student visa. A visa can enter and leave the United States many times in 1 year. If your visa expires and you need to enter and leave the United States again, you need to return it. If you don't transfer or major, you don't need an interview. Just give your application materials to CITIC. If your visa expires, you don't need to sign it in the United States. You only need a visa when you leave the United States and come back. I had an I-94 entry card during my stay in the United States. The validity period of the student entry card is D/S, which means depends, which means you can stay in the United States as long as you have not completed your studies. If you drop out of school, your I-20 will be invalidated immediately, but you have a grace period of 60 days, which means you must leave the country within 60 days, otherwise your identity will be black, and it will be difficult to re-enter the United States next time, or it will be difficult for you to change to another identity in the future. If you don't have a scholarship, it will hurt the department less, but if you have a scholarship, it will hurt the department more, because giving you money means that the department has rejected another student. Maybe the rejected one is more like studying hard than you? In addition, the use of planning funds by various departments is planned according to one year. Having a scholarship means that you have to undertake certain teaching or scientific research tasks in the department. If you suddenly quit, where will people find someone temporarily? There are many procedures for recruiting people in America. Furthermore, if you drop out of school, it will be difficult for your younger brothers and sisters to apply for scholarships, or even to enroll, because the teachers in the department will think that people in China are too dishonest. So it's best not to do this. If you don't plan to finish your PhD, apply for a master's degree directly.