Plotting Durations with Perspective XY Charts

Is there any way to plot durations with Perspective XY plots? I’ve tried using the various date formatting options but can’t get anything to show up properly or look right. I’m stumped. Is there any support for this? I really don’t want to have to put fractional hours on my plots as values.

Ideally, I’d be able to show HH:mm:ss type durations on the y-axis of my plot.