Help with Timer Users Can Set Themselves

Really happy to have found Adalo and build my first app. One of the things I am trying to do is to create a timer where users can enter the amount of time themselves and that then counts down to zero - and ideally plays a notification sound.
If someone could walk me through how to set the time in such a way that the timer captures it and only starts when the user presses the start button, that would be great!!

Looking forward to your answers!

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