How to count total running time of a process in SLC 500

Hi, does anybody know how to count total running time for a process in SLC 500?

I like to know how long a process takes from the beginning to the end.  The process running time is

different from a batch to another.  The counting begins by a switch and ends by a condition.

Assuming total running time is 10000s, how is this number converted to a format for HH:MM:SS?

Thanks.