16k is indeed pushing it, certainly w.r.t. generation (they'll recognize around 16k words, but won't be able to use them). And because they're never going to re

16k is indeed pushing it, certainly w.r.t. generation (they'll recognize around 16k words, but won't be able to use them). And because they're never going to recall truly random words, there'll be 30 bits or less in the final passphrase. Just in case: correct, horse, staple, battery are far more frequent, and acquired earlier in life, and thus more likely to be part of a passphrase than e.g. rime, bagnio, pungently, cruse.