I have a graph in
Date | Duration
2015/09/23 | 00:21:32
2015/09/22 | 00:28:43
2015/09/21 | 00:25:54
Shortly after posting this I figured it out.
I converted the duration to
Time(0) within the SP, and displayed the un-Aggregated version of the duration on the bar.
Then right clicked the vertical axis > properties > Number.
Then changed the Custom to HH:mm.
Is now properly displaying it as
00:20 up the side.