Students in degree programs are permitted an overall limit of 18 months, which includes all academic training, whether before or after completion of studies. The total training period may not exceed the amount of time spent in the full course of study.
Postdoctoral training after completion of a U.S. degree the overall limit is 36 months. A new DS 2019 will be issued for the second 18 months.
Students in a prescribed course of study in a nondegree program, the total stay is limited to a maximum of 24 months, inclusive of all study time and any authorized academic training.