First of all, what are you doing reading that +1 year old question? It's no longer relevant today. If you are seeking guidance on that post just drop it.
Secondly, the problem with the general tone of the question is that promote a passive approach when engaging users/askers (comment, wait, comment again, wait, VtC, wait, wait a bit more, etc.) which simply doesn't work. Such behavior motived Stack Exchange to write the blog post and, at the same time with the title, ask us to Vote Early, Vote Ofter, which can be colloquially translated to "vote first, ask question later".
The post you link to, was referring to the fact that people where trying to close unanswered questions that kept waiting for answers for a long time (hence the title), but didn't took into account the fact that there are several factors that have to come in play to get a question answered:
- The question can be reasonably answered.
- There are people that can answer it.
- The activity cycle of each question.
The first case should be closed. Done. No waits, no buts, but just plain and pure closure and deletion. People will say that such approach is aggressive, but the system already waits a year to delete uninteresting questions (no votes), and yet such conservative period of time is being reviewed over other parts of the network.
The second, can be easily solved giving exposure and linking anywhere else, which in fact I've done several times with interesting questions that I've linked in UL chatroom that I've found when cleaning tags.
The third, the system is supposed to take care of it, yet, it depends of us humans to decide what cruft to delete and what to keep, and we seriously suck at optimizing the system job, since we decide to leave open and upvoted several questions that should be closed/downvoted. Is a problem with what the community believes is a "good question", and the long trail of similar asked questions that remains in the system also promotes this believe. BTW, people which questions were automatically deleted can undelete them, so you have nothing to fear about deleting questions where OP came back alive, again.
So, to actually answer your question "How long is never?" the answer is: 0 seconds. Waiting for some kind of activity is like, while you are in front of the market and know that the milk is almost expiring, you decide go home and wait until it expires so you go out and buy more.
If you can solve the problem now, just solve it.