In my opinion, the author of the post wants a uniform, smooth movement, so the clock speed must be as low as possible. The slider method won't really work here because the slider accuracy is low, as @Juan_Antonio mentioned. The slider will not have smooth motion, only jumps as seen in the @Anke app.
It's a good idea to use an arrangement or any other component and play with its width. Here is an example of a progress bar made with an arrange. Its accuracy is not based on the timing of the clock component, which we know is not very accurate. I achieved fluency and accuracy by reading the current state of the milis counter.
progres.aia (3.6 KB)