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How secure is changing a word in your 24 word recovery phrase as extra security measure?

When I wrote down my 24 words for my Ledger Nano, by chance the last word had some personal meaning to me, something that I will never forget. As extra security I didn't write down that 24th word, but changed that last word with a random word (tower) I put those 24 words in a safety deposit box. I was wondering if someone get hold of those 24 words, how long would it take them to discover that the last word is incorrect, is it easy to brute-force it to get to my real 24 words?
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