How long did it take you to get all the letters?

I ask this because since end October i have been waiting for one letter(incidently "E").In November i did 29 missions and this month so far haven't missed a mission.So in all have tried around 40 times to get this letter.I am beginning to think that this is rigged or can my luck really be that bad?
Could z8 not amend this for example if you wait 10 days and don't receive a new letter you are awarded with one, like a kind of like a bonus letter.I wonder if crate system is done like this because its a ZP item it feels like its fixed like a casino slot machine.Has anyone here completed the letters and got crates in a reasonably amount of time? In all i think its taken me around 3months so far still without success.
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