Yes, you're correct.
By: Emil Wojcik : May 19th, 2022-18:01
At 18,000 BPH it "ticks" 5 times per second so if you look close you can easily see it "jump" those 5 steps every second, at least with a full sized second hand -- not as easy to see with a small sub-second hand. At 21,600 BPH, it ticks 6 times per second...