Each STEM OPT student must report to their DSO any material changes to, or material deviations from, the student's formal training plan. Learn the consequences if you engage in serious immigration violations of your F-1 or M-1 student visa or status in the United States.1 Student Seeking PostCompletion OPT After Completing Studies(c)(6). How long can I remain outside of the U.S. and still come back to my OPT? Technically, if you are outside the U.S. for 5 months on an F-1, you end your status. Nonimmigrant students must comply with certain federal laws and regulations when seeking employment in the United States. Travel Internationally. The ISSO can advise international students on what is required to enter the U.S. after travelling abroad. It is your responsibility to work in a job that is related to your major. Student does not have to secure training before the DSO can recommend OPT.