Hi WD
Up until about a year ago all review letters were being sent out a year before the review date, but many members have reported that they have not received theirs and it seems the length of time between letters being sent out and the review date has been shortened. It's impossible to give you a definitive time, but I have come across several people whose review letters arrived with only 3 - 6 months before the end. They are behind with many things so I think you just have to wait.
BIS
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