For me, it's nearly 11 months at this time, right now. Surprising enough, it's the first time where I am staying as much time with a huge time of activity (41 days right now) without leaving, and posting a decent number of posts (540 right now), so I guess there's something "special" which makes me stay and contribute. Which are the community and with Mario Party as a main subject.
I like how the forum is about Mario Party, this makes the forum special for me. (Although I'm mostly in these kind of topics, because of how I like the overall franchise, but more about the newest ones, and a lot of the Gamecubes ones.)
I did spent a good time here, although it's quiet at times and I don't come all the time and by how forum discussion is not always my kind of thing...