The overall time a night lasts is 8 minutes, so if you keep on using the power (closing the doors for as long as you can before power runs out), it should only last 6 minutes, so that it runs out before the night ends. If you do NOT use the power at ALL, then the power should last 8 minutes, exactly the time (don't know if you can change this interval).
I set it to where it only drains power when in use. The only other question i have is how much power do you want restored when button is pushed and after that i got pretty much all the redstone done that i can do.
Which button? You mean the generator button? In that case, half the power should be restored, which will give the player a second chance. But the generator button should only be used once (resettable after game ends).
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