If you mean I-20, it can be issued shortly (next day to a few weeks) after admission decision is made.
If you mean F1 visa stamp, once you have I-20, you can make visa appointment up to 120 days before school begin date.
If you mean change of status from current valid non-immigrant status to F1 status, see the I-539 processing time of your service center.
If you mean F1 visa stamp, once you have I-20, you can make visa appointment up to 120 days before school begin date.
If you mean change of status from current valid non-immigrant status to F1 status, see the I-539 processing time of your service center.
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