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Following up on my question, Ariyathach would like to provide additional information as requested by the doctor. The machine used is a Yuwell YH480.
Thank you for the additional information.
According to the Yuwell manual, Used Time refers to the duration the device operated during the last treatment, while Treatment Time refers to the duration the device recorded that the user was wearing the mask.
Therefore, if the mask is worn continuously overnight without turning off the machine or removing the mask, but the Treatment Time is consistently 2-3 hours less than the Used Time, further investigation is needed to determine what conditions the machine uses to calculate Treatment Time, as the manual does not explain this calculation method in detail.
We recommend contacting Yuwell or their distributor directly for more information on why the device isn't counting treatment time during certain periods, even though the mask is still on and the device is operating.