Hi @jinu_mohan ,
I checked the MCUXpresso IDE related document:
C:\nxp\MCUXpressoIDE_11.5.0_7232\MCUXpresso_IDE_FreeRTOS_Debug_Guide.pdf

It is the percentage value, so, it should can't change to the seconds, more details, you also can check the above IDE document.
Best Regards,
Kerry