Duration as Y-Axis Label

Hi, All,

I have a two-column table: "Date", and "Average Length of Call in Seconds".

I need to create a visualization showing Date along the X-Axis, and Duration along the Y-Axis.

Easy enough, but I need the Y-Axis to be formatted as MMS instead of a whole number (for example "05:02" instead of "302").

I've searched through the Forums, and the Community Blog and see several threads about duration, but haven't been able to achieve my desired result.

Thanks, in advance, for any help!

--Michael--