Bip39 Github. Though there are BIP39 wordlists in languages aside from English, it is strongly not recommended to make use of non-English words for wallet backups. It would make restoring the wallet complicated or not possible. No, there isn't a technological limit for the duration of the passphrase. Nonetheless, with https://hyperbookmarks.com/story19067700/bip39-words-https-linktr-ee-bip39-what-does-ian-coleman-bip39-mean