[ResMed AirSense 11] Consistently show durations in 'readable' format (HH:MM:SS)

When hovering 'Session times' in the 'Overview' tab, the 'Start' is given as a timestamp, whereas the 'Length' is shown in decimal hours (e.g., 3.5 -> 3 hours and 30 minutes). This makes it a little unintuitive to analyze stacked / successive sessions.

Also, the 'Usage' duration is shown as a decimal duration, whereas 'Total Time in Apnea' is 'properly' formatted. Still, the header of the latter graph displays decimals durations.

I could see the need to compare decimal durations, but would prefer to have a consistent (configurable?) format being used.