Countif equivalent using DAX Formula

Hi All,

I am working on my powerpivot and trying to create a DAX formula to capture items with a duration that are equal to and greater than 30 seconds (>=). Here's the sample table that I have

Stel Table.JPG

Initially, I am using this formula =CALCULATE(COUNTROWS(STel),STel[Duration]>="0,0,30"), but it is counting everything. By the way the duration format is "hh:mm:ss AM/PM"

Thanks for your help!

I figured. I realized that the duration was separated by a comma (,) instead of a semicolon (