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The partial pressure of oxygen (ppO2) should be higher than about 0.16 bar and lower than about 0.4 to 0.5 bar for longer exposition of some days up to a week. So breathing pure oxygen for a week is possible when the total pressure is not above 0.4 bar. See also my answer to the question How long were the Apollo astronauts allowed to breathe 100% oxygen at ...

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