You will note in your data that you posted above, and I verified it in the online report, it shows you have 0% of days at 4 or more hours. This is important for compliance purposes. So, the 2.4 While Breathing Hours is saying you only had the mask on for breathing purposes for 2.4 hours in the last 24 hour period. Which is why your 4 or more hours is 0.While Breathing Hours
While breathing hours are only available within the last-day timeframe and with the cumulative code. This measurement shows the total hours of use.
If you think you are sleeping with the mask on for more than 4 hours a night, something is wrong with the data. I would contact either your DME, if local, to check the machine out for you.... or you could call the online vendor from whom you got it, if you purchased it that way. But be sure you KNOW you haven't taken a lot of breaks, taken the mask off for periods of time, etc.
You could also ask DeVilbiss Marketing to see if she can give you any insight as to why the data is giving you these outputs.