Have you ever had a dinner party that went on too long? Guests who didn't know when to leave? We think the royals of Versailles had a great trick for limiting how long a party would last. The many chandeliers in the Hall of Mirrors used to hold candles. 1000 candles. Candles that lasted just four hours each. Which means, if the servants lit all the candles at once, then you opened your doors and let all the guests in, no matter what happened, the candles would run out four hours later and the party would be over. You don't see THAT at home!