Ever had something you wanted to leave running on your system, but needed to have it automatically shutdown at a certain time, yet it has no ability to do that on its own? Enter the "auto kill" trick. I've done this on several of my machines over the years, and it works quite well.
First, you will need to find either the id, or process information about the program(s) you wish to automatically kill at a scheduled time. If you go into the console and type "ps -ax", it will give you a list of all the currently active processes.