how to get time for Estimated exec. (min) automatically

[suj2pay]

Hello all,
I am novice to testlink. I am writing the test cases for my software which is excecute automatically. I have used testng, selenium java and jenkins. The testlink I am using is version 1.9.14(Padawan). I have testlink plugin to collect test cases pass/failed result and send to testlink from jenkins.

But I need also execution time taken by each test case automatically and display in the testlink testcase. The time taken by each test case is shown in testng result but I don't how to collect and put in the testlink.
I don't have any idea. Please Help me.