What is the likelihood of hackers brute forcing stolen lastpass vaults?

As you all know, there was confirmation that there was a hack on lastpass that leaked customer password vaults. Lastpass uses 256 bit AES encryption that is derived by master password and the username as the salt. Lastpass uses 100,100 rounds of SHA-256 iteration of the master password to get your encryption key which supposedly slows down the bruteforce attempts. What is the actual likelihood of hackers to crack these vaults with passwords with at least 12 characters and complexity. …

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