Bip39 generator python https://ameblo.jp/generate-bip39brooks/entry-12913353546.html Let's assume It's going to be 10x quicker when compared to the GFX card previously mentioned so around 2,4M hashes/s. A standard attacker will very own a couple of these types of specialised products. For words that have only 3 letters, there isn't a 4th letter. https://ameblo.jp/generate-bip39brooks/entry-12913353546.html