At the supper club where I work most of the time, we NEVER rush anybody to finish, and routinely stay late until everyone has plenty of time to eat, drink and be Mary (or merry).
However, when there are waiters, bartenders, busboys, dishwashers, valets, cashier, and security, not to mention the BOSS waiting around for one table of people who have finished eating, are not drinking and have lingered well past closing time, it's a losing proposition for the club.
I don't play music to run them off, I just tell the goodnight and turn OFF the music.
DonM
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DonM