Considered nodes are a hint to the janitors that they have some work to do. It can happen that the work gets done in a fashion that doesn't reset the consideration (perhaps even by the OP) and it may take a short time before that is noticed and fixed, but generally that isn't more than a few tens of minutes.

If you notice something that has been in a really bad state for a long time then you could /msg janitors, but please, only for something serious. After all the janitor who fixes the node might have been answering a question (some of the janitors around here are quite bright - for janitors), and we wouldn't want to delay that would we :).