I am working on another school project, and I am having trouble making a timer

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I am using 1.19.3

I am trying to make a simple timer that starts when the scene starts it starts going tenths of a second. (or second maybe) I want it to stop when something hits something.

So far I have tried adding to the project.timer and setting the text every time a clip gets to frame 24, (thats my framerate). I have tried using a set interval that literally created a bomb that lags out almost any computer. :P (i dont think I was using it correctly)

I just want a relatively simple solution. Thanks!