timer as Tilebackground C2

Hi Community,

I'm trying to build a timer, so each game last 3 mins (180000 milliseconds) - right?

I have variable named TIM and a Tilebackground which 'set width' is set to TIM.

The way I did this, the Tilebackground left the layout & went to MARS. my Layout width is 640.

Is there a way to have the full (percent) of the Tilebackground and it runs out over the duration of 3 mins.

Hope this makes sense. I knew I should have finished MATH in elementary school

Thanks,

Roberto