Object Time Limit?

[im2famous4u]

What is the easiest way to create a time limit for an object? For example, once the object is created I want it to destroy itself after 5 seconds. I have tried creating an alterable value for the object, and then subbing 1 from the value every second, then destroying it when the value equals 0, but it won't work. Any ideas?

[Popcorn]

* always
- object: add 1.0/FrameRate to alterable value A

* object: alterable value a >= 5
- destroy object