How long does it take to get your MAAT title/letters

Does anyone know how long it takes for AAT to give you the MAAT letters? I submitted all work experience etc, and all was marked as competent by AAT before receiving my last exam result. Received my last result on 21/12/2017.
Thanks
Thanks

AAT Level 3 - May 2016
AAT Level 4 - December 2017
AAT Level 4 - December 2017
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Just waiting for my certificate now!
AAT Level 4 - December 2017