This question asks, quite simply "How many days have passed from the start of the show to the events of the last episode?".
This answer makes no attempt to address the question, and instead discusses how long someone can survive without food or water.
Normally, I down-vote on-topic answers that are of poor quality, and flag for moderator attention answers that are either spam, should have been a comment, or answers that don't address the question at all.
I have a number of flags for "not an answer" that were marked as "helpful" (12, actually). However, the flag on the above answer was declined, saying "flags should only be used to make moderators aware of content that requires their intervention".
What defines an answer as "not an answer", and when should flags be used to draw attention to them?