How can I display time format in Flex chart?

Let's say i have two records which i am trying to display in my BarChart:

1. ID = test1
Duration = 05:50

2. ID = test2
Duration = 07:55

And i would like to display those records so that ID is on y-axis and Duration is on y-axis. The problem is i can't display "min:sec" time format as a value on axis. Is this even possible and what options do i have for displaying time?

thanks in advance