What is the longest amount of time your discussion has gone unanswered here?

I'm not sure, though if I remember correctly, it's somewhere around the 2 month mark. I believe it's not uncommon for a discussion to remain unanswered at all. From personal experience, I've found that a discussion is more likely to receive replies during the week-end, because people are generally less busy and have more free time. Furthermore, I believe it's how interesting the discussion itself happens to be.