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In page Meditation:

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The Transcendental Meditation technique recommends practice of 20 minutes twice per day.[1] Some techniques suggest less time,[2] especially when starting meditation,[citation needed] and Richard Davidson has quoted research saying benefits can be achieved with a practice of only 8 minutes per day.[3] Research shows improvement in meditation time with simple oral and video training.[4] Some meditators practice for much longer,[5][6] particularly when on a course or retreat.[7] Some meditators find practice best in the hours before dawn.[8]