I don't think it's a fixed number. I think the thread limit actually goes up the more frequently people post. So if some board doesn't see any activity for awhile, the old threads from the last wave of activity will remain and eventually start to disappear (for example, Paris Hilton's board is so dried up now it looks like a tumbleweed will pass through it at any moment). On the other hand, if a board that hasn't been active for awhile suddenly gets a flood of new discussion because the person is in the news (i.e., Selma Blair being removed from that flight), then the really old threads will suddenly vanish. It's more about keeping the board current than it is about keeping the number of threads fixed, but the rate at which threads are removed is slower if the activity is low. If a board has so many threads you need to navigate multiple pages it's because people on there make new threads on a daily or hourly basis.
Must dash. I forgot to feed my wombat.
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