I'd like to have a visual countdown for my 2 year old.
Tap to chose the app, cycle time with left and right, then press center button to start the countdown.
Options for 30,15,10,5 mins.
The trick is that instead of showing a numeric countdown, the full display is lit to begin with and slowly turns off, so that when the countdown has run out, the screen is fully black (or the inverse works as well).
Help him children learn the passing of time!