Minimum investment on a descent rig for 16+ character NTLM passwords

[phildo]

to be fair, he could mean "brute force" against a dictionary of common passwords (as opposed to "really" brute forcing all possible combinations...), in which case pass length is likely unimportant?

and sorry I can't answer your question- I don't know anything about the nature of the hashes you're trying to crack... :/

But my rig is ~$3k, nvidia 1080Ti + 8-core i7 + 32G memory. No idea how "optimal" mine is, or how it relates to your specific problem space. Sorry! ¯\_(ツ)_/¯