Oh, you can CREATE passwords for a hidden o/s longer than 64 chars, and you can even mount them on another system using mount without pre-boot authentication, but what you can't do is actually BOOT the hidden o/s because the bootloader has a 64 character buffer, and that's it.So you cannot boot into a hidden o/s with a password over 64 characters.I may have created a hidden o/s with a password too long to boot with, and had to force-fuck the info onto another, bootable hidden o/s, but I'd never admit that.