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How do I make this?

Hey,

I’m really new to this so please excuse me. I’m trying to make a widget go down by 1 every 30 seconds (for my hunger bar), I’ve played around with this for quite a while and done some research, and I just can’t see to be able to work out how to do that. I’m currently watching https://www.youtube.com/watch?v=iFu2WXc8lz0 but it’s not really helpful for the timer area of what I want to do.

Thanks