I have a wallet with ~2,400BTC and I forgot my encryption passphrase. It was >400 chars and I know most of it but I'm making some mistake somewhere in my recall. If the value keeps going up I'm going to have to get serious about cracking that wallet.
I meant measures beyond remembering really hard. Writing software to brute force it with the bits I already know. Believe me I'm pretty unhappy about the situation.
Provisioning EC2 GPU instances and the like and writing the grammars.
If someone has the incentive to break into your wallet, all you need is a phrase long enough to make physical violence a better alternative for the attacker, and you're set, no need to make the phrase any longer.
