VBScript - Timing ... is everything

Hello everyone,
I am looking for some code to create a timer on some of my scripts. I just thought of this and came here first to make my request. I'll go out on the big, ominous WWW to see what I can find, but you guys are so good, you'll probably beat me in finding the code.
So, I am writing a bunch of scripts that will test my kids on thier math. My 8 year old is having trouble with her subtraction and my 11 year old is working on powers. So I want to add a timer to the scripts so it will ask the user how much time they want to run for, then have the timer run for that amount of time, ending the script after the time is up. I figure it will just run off of the system time, but I'm not sure if that is the way to go or if it will just run a counter to that time specified. I'll post some code here of my scripts when I get a chance, the code is on my laptop at home at the moment.
But if any of you have some idea's on a timer, I would really appreciate your knowledge and input. Is this an easy task or will it get complicated ?? thanks.

Building timers in VBS isn't as straightforward as you might think it would be. Take a look at the Timer() function. Some simple subtraction might get you where you need to be.