Instead of the arrow icon on the sliders being always the same, make it so that if the slider goes back and and forth more than once the icon on the slider changes accordingly to how many times it is going to happen/make it just indicate that the slider will go back again.
This way in case you're dealing with very fast sliders you will know how many times they repeat just by looking at one of their ends (basically just makes it easier to see what the slider is going to be like).
This way in case you're dealing with very fast sliders you will know how many times they repeat just by looking at one of their ends (basically just makes it easier to see what the slider is going to be like).