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It is important to note that the two (or even more) hour meditation period which is the rule in most Zen monasteries is prescribed for their particular milieu and not for the world outside it. Thus a modern Zen master told his American disciple that a third to a half of an hour daily would suffice for meditation when back in his own country.
-- Notebooks Category 4: Elementary Meditation > Chapter 2 : Place and Condition > # 383