From LivingPianos.

https://livingpianos.com/how-much-should-you-practice-scales/

Welcome to Living Pianos! I’m Robert Estrin. Today, we’re talking about the law of diminishing returns when it comes to practicing scales. You might have heard about some teachers who encourage their students to practice scales for hours on end—sometimes even neglecting actual music! While scales are undeniably important, focusing exclusively on them can lead to frustration and burnout. It’s a shame to see anyone lose their love for the piano simply because they’re stuck in a monotonous practice routine.

Additional content: https://www.youtube.com/watch?v=YAa8_Bh9swc