Might someone take this literally, and imagine that you have three options: buzz 4512 times, or 9028 times, or, well, “just ring the bell”? On the one hand, no one is going to actually read this and think that’s what it means. On the other, it does helpfully present an end to the continuum of poor doorbell instructions. It is, perhaps, the extreme state against which other doorbell fails could be judged.