I understand, but LastPass doesn't store your passwords in hashes and instead encrypts them. Hashing is not the same as encrypting.

Anyone with a master password longer than 12 characters and not reused is fine. We're dealing with very large numbers and using the AES256 standard.

AES256 is the default encryption, if it was broken Bitcoin and everything that is encrypted would be crashing. It would make world news, this very site would stop functioning.