I was looking for a question on recommended password length for a typical usage case for users. Say, a good password length that would guard against realistic threats, like a password cracker with an 8-GPU machine. I couldn't find a good question, although I did find some likely duplicate questions that have issues described below. Even though I feel this question can be answered well on this site, I strongly believe it'd be shot down and closed as either opinion-based or a duplicate if I don't address the issues here first.
Previously, most questions asking for a recommended password length that users should choose (like this) have been confusingly closed to this question about password length limits: How long should the password be?. Since most of the answers focus on what the administrator should put the limit at instead of what the user should choose, this seems like a case of irresponsible duplicate closures. So I want to ask a new question and not mark it as a duplicate of this question. In addition, to prevent confusion in the future, someone should probably edit the other question's title to make its purpose more clear and redirect the duplicate links to the new question.
I'm also a little concerned this could be closed as opinion-based, but it seems to meet the criteria on Stack Exchange for a constructive subjective question. Considering that there have been entire news articles and research papers discussing how easily different passwords can be cracked, this seems like a question that would inspire fact-based, detailed answers, not casual recommendations grounded on anecdotal evidence.
I would definitely keep the scope of the question narrow. It would apply mainly to the average person's Facebook or Amazon account assuming an offline attack is possible, not to the broad set of special circumstances like throwaway accounts , or accounts attacked by Anonymous.