No loud music or voices. Nothing that can disturb a neighbor. Usually 10pm to 7am.
Also, the use of generators is usually prohibited during quiet hours. Try to keep excessive lighting to a minimum as well :)
It means to be quiet
It means you can always look forward to your neighbors coming by and telling you to turn the music down at any time of the day, God forbid you have your music playing at around 9pm.
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