Something I remember from education classes back in college was that to get the most effective learning for new physical skills is that they should be performed in 20 minute increments for approximately 3 weeks. It had to do with the difficulty in remaining focused for a longer period of time. Of course everyone learns at different rates and some may not take the 3 weeks to master the new skill.
Yep....this is what the research shows to be most effective for most people -- short yet very focused quality practice sessions, 2 or 3 times daily.
But most pool players don't believe it, so they stick to the old school approach, where quantity of practice ranks higher than quality of practice. It has been proven, in both academics and sports, that 20 to 30 minutes of 100% focused practice is far more effective than a multi-hour practice session with intermittent levels of focus throughout.
In other words, if you want to improve a certain part of your game, like spot shots, practice intensely for 30 minutes then take a break and come back and do it again in a few hours. If you can remain 100% focused for longer time periods then nothing says you shouldn't do that. But for most people, practice can become monotonously boring after just a minutes. From that point on you're not giving it 100%. You're basically just putting in the time (quantity), but your practice lacks the quality needed to be really effective.
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