Most people generally don't get their concentration strong enough to get to the stage that is described in the old texts by the standard phrase “the mind made pliant and malleable”, but if they do, they will be richly rewarded. Someone practicing hard jhana all day long with few breaks except to bathe, eat, wash, use the bathroom, and sleep may, if they have talent and diligence, be able to accomplish this level of concentration in a few weeks or perhaps a few months. Success would also depend on many factors of the practitioner, practice, and setting that are hard to quantify. Talking and
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