You wont receive an email regarding your ban/restriction. You would have been told in-game how long your restriction is/was for. If it's a ban, then it is forever.
English
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Im Spiel steht immer da, dass ich nur vorübergehend gebannt bin aber keine genaue Zeit.
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It would only show on the first message viewed. Each subsequent time just says you're restricted/banned. If you overlooked it, then you will just have to wait it out and keep checking. You will not get a message from Bungie or another in-game statement on the time frame.