回複:Please help, from H1B TO F1. How long time for USCIS to take

Look up I-539 Processing time of your service center (CSC/VSC)
If start date on I-20 is in the future, USCIS can RFE you to asking proof that you are still in valid H1 working for H1 sponsor between the receipt date and I-20 start date.

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