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It varies depending on the humidity in the room. As short as 24 hours, as long as 72+
Sorry, there was a problem. Please try again later.Hi there, this is Tia from Dyson. Happy to help! The PH04 is designed with an efficient water management system and a one gallon tank give you up to 36 hours of hygienic humidification without regular refilling. Thanks for your support of Dyson technology! Best wishes, Tia Dyson Customer Support
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