I'm guessing that its probably members returning after quite some time that are doing this, so the posts being counted is quite high. It was a problem I hit a long time ago, and actually wrote a time limit into the code on our forum (we use a totally custom version of this, not released anywhere). If I think about it I'll see if I can incorporate that into the 3.7 version at some point. I'm afraid it will not get added to the 3.6 version as I never support more than one active version, and by the time I do this, that will be the 3.7 version.
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