The main idea of the program is to synchronize your PC's clock in the most reliable and resource-saving way. Clock in your PC needs to be corrected only several times a month.
And it is this fact that defines the way the program works: the program runs when Windows starts, checks whether synchronization has been done this day already, and stops immediately if so.
Otherwise the program checks for Internet connection, then tries to synchronize your clock and ends its work if succeeded. So as you see mostly the program is idle and is not wasting resources of your PC.