The F-1 visa is usually valid for the full duration of your academic program as mentioned on your I-20 form. This means you can legally stay in the U.S. for the entire length of your studies. After completing your course, you receive a 60-day grace period to prepare for departure, apply for OPT, or change your visa status. Even if your visa stamp expires, you can stay legally as long as your I-20 and student status remain valid.