How to make 20 minutes (1 day) delay? [duplicate]

I am getting tired of manually managing my chicken farm, so I have invented this automated design:

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The step from eggs to chicken is easy, and it's even simple to make it happen in batches - every time dispensers are filled using hoppers, a comparator activates clock until they're empty again.

What I need is to set up is a timeout that activates 20 minutes after the dispensers have stopped shooting. A minecraft day has 20 minutes, which brings the idea of daylight sensor. But note that timeout may start any time in the day, not the same time every day.

And please, I need something that is not bigger than my house.

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minecraft-java-edition minecraft-redstone

Best Answer

Or another option: a despawn clock. Items take exactly 5 minutes to despawn. So you can use 4 droppers and 4 wooden pressure plates as your timer (because 4*5=20, obviously). Each pressure plate is on a block with a redstone torch under it. When the dropper spits an item out, it turns off the torch for exactly 5 minutes, then turns it back on. You can use this to trigger the next dropper in the series. After this occurs 4 times, the last output is your clock output.