Emboss Designs: Max Playtime Alarm
Factorio getting in the way of real life? Place this down, set the time constant (default 60 minutes), and you'll never need to worry about that again.
Includes a Global warning, occuring 5 minutes before timer expiry, ignore it at your peril.
Details on how to use it: Clock Circuits Mini Tutorial https://youtu.be/5sfJkL8Hcn8