I'm going to run a simple experiment: discharge a battery and register its voltage for several days or even weeks.
And I want the data to be shown on a line chart with x-axis formatted as duration (ex. "42H").
Note: data points may have fractional duration (ex. 12.34H). I could format the data using labeled categories "0.0H", "0.1H", "0.2H" and so on. But in that case x-axis on the chart becomes ugly - with fractional number labels. So it's not an option.