If you’re looking for something polished and complete, something like this might be a good pick:
If you’re looking to DIY it, you’d just need scripts on each Pi listening on a pin to run a shutdown script, and a microcontroller with an RTC attached to trigger that pin, and another output for each of the Pin 3s to turn on the Pis: https://forums.raspberrypi.com/viewtopic.php?t=217442
Let me know which appeals to you more, and if you have more questions!
-James
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