This question is more for general information on how the reopen review process works, but for those who prefer to deal in concrete examples, the post which prompted this is here.
About 24 hours ago I voted to reopen a question (the first result of a Google search with similar terms, question score of 20, answer score of 50, no downvotes). Despite being a day later, it still has only my one reopen vote. After painstakingly going through 16 pages of review history for the past 24 hours, it does not appear to have ever been reviewed. At the time of this posting, there are only 14 questions in the queue, so it should definitely have seen the light of day by now.
Therefore I must conclude that it did not in fact enter the reopen queue. Is this true? If so, what action is needed to place it in the queue if not nominating it for reopen? What prevents a post from entering the reopen queue?
Again, not asking about the one particular question, but rather about the workflow and process behind the scenes which leads to this state of things.