Yes, it's accurate. Our stats are recorded by points, at the moment. Once we get some traffic, we'll switch over to KDR for a ranking system. Also, everything is done automatically by our admin plugin -- I don't have any control over the actual rankings.
And I'm not sure how often it resets... we'll just have to wait and see. I think they have a "decay" system in place, where after such an amount of time passes, your old points start to lose value. I'll have to dig around a bit and see how it's configured.