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Unemployment 섹션 읽어보세요. Unemployment 90일 넘어가면 OPT 규정 의반으로 취소고 출국하셔야 하지요.

https://studyinthestates.dhs.gov/sevis-help-hub/student-records/fm-student-employment/f-1-optional-practical-training-opt#postcompletion_opt_and_unemployment