Bip39 mnemonic seed phrase http://www.video-bookmark.com/user/tucanewhmt Let's presume It's going to be 10x quicker as opposed to GFX card above so roughly 2,4M hashes/s. A standard attacker will own several this kind of specialised units. For words that only have 3 letters, there is not any 4th letter. One example is https://socialistener.com/story6147363/bip39-passphrase-new-step-by-step-map-for-bip39-word-list-txt-https-t-me-bip39-chat