A Duration of Stats (D/S) means the length of time a visitor to the U.S. is allowed to stay depends upon terms and conditions of his or her status. For example student visa allows visitor stay as long as the student status is still valid to finish his or or program by the program date listed on Form I-20. This is most seen on I-94/admissions stamp of visitors with student visa (F1 or M1) or diplomatic visa (A1, A2, G1, G2, G3 and G4).
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