True, I really don't know the exact entropy and perhaps an attacker will have access to large amounts of my previous writing, which might help them guess how I

True, I really don't know the exact entropy and perhaps an attacker will have access to large amounts of my previous writing, which might help them guess how I would connect different domains. We know the relationship between horses and batteries, but what's the weight of the relationship between snails and purple? But 30 billion hashes a second is quite a hashing rig, and even if they could reduce the entropy by a 2 orders of magnitude, they're still looking at nearly a hundred years. With a hard algorithm, like bcrypt, or without access to my writings, that password is impregnable.