Fixed time interval

Hi, I'm creating a file that needs to be a fixed time rather than each stimulus presentation being shown for a fixed time. The program is looking at multiple key presses (either 'Z' or '/') and I need it to be 5 minutes long and record key presses. For example, some participants will have 5 key presses whereas others may press the keys 40 times. The study is looking at intrusive thoughts so I'm basically trying to record the occurrence of a particular thought. How can I set this time limit and for the program to then move on to the next task after the 5 minutes has elapsed? Thanks!

Take a look at this and see if it helps:
[URL]http://www.empirisoft.com/support/showthread.php?t=115[/URL]

I've figured out how to do what I want with the !meta command and "end" with a time limit, however, I'm still having some problems. I'm running the program and sometimes it is terminating at the specified time but other times it will not and instead go over the time limit completely and then terminate. Am I doing something wrong?