The best answer I can give you is there is not a standard guideline. Some people get called back immediately while others aren't called back for 6 months. The hiring is all based on demand. With that being said I think it's ok for you to check in occasionally as well and ask for an update...... Please note I said occasionally to me that means every 3 to 4 weeks until I'm told otherwise. Anyway good luck.
I am a Vendor for FedEx. I would be patient.
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