I have a bunch of events that vary in duration and also vary in how recently they occurred. I want to graph these events so that they look like a typical bar graph, with all the bases resting on the X axis and the Y axis representing time. This way it will be easy to see which events lasted longer than other events (the taller the bar, the longer the duration of the event). But I also want to express how far in the past each event took place. More recent events would be closer to the origin than the ones further back in history.
I think "duration" is a good label for the Y axis, with "hours" being the unit of measure. As for the X axis, I'm having a harder time deciding on a way to describe the property that it will represent. The units of measure will be "days", but I want a word or short phrase to use on the X axis similar to the way "duration" characterizes the Y axis. The best I could come up with is "temporal proximity".
Does this work, or is it going to sound stilted, contrived, pedantic... etc.?