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The bump limit is implemented on all boards and dictates how long a user can bump a thread to the board's front.
This means that after a certain number of posts, a thread will be archived automatically.
In /vip/, a couple of reoccurring posts are continuously bumped to the front of the board , Kpop being one of them. Eventually, these threads will reach their bump limit and progress down the board until it is archived. Usually, when the bump limit is reached, a new thread is created.
Using "sage" in the options field means a post does not count towards the bump count, so it does not bump the thread to the front of the board and could mean you keep your thread alive longer by not bringing attention to it.