Once it's past 10:00 pm on a week day it's time to shut things down and no later than midnight on the weekends. I know first hand what it's like when someone revs up their car or boat after 10pm on a week day, it's hard for those who have to get up in the morning to get sleep with someone doing that. I have told rowdy neighbors that I would call the cops on them for disturbing the peace after 10pm.