I’ve also heard of people who played poker for almost two days in a row. I’ve seen slot players glued to the screen right before clocking out at the end of my shift… then see them again the following night when I clocked in. I’ve seen people leave the house at 3am because they couldn’t fall asleep and show up at the casino and play blackjack. Some people want to gamble all the timeĪs a casino dealer, I’ve seen people play for over 24 hours in a row. The second reason is that by being open 24 hours, casinos can maximize their profit because some customers will play until they lose, every single time. The first reason is that some people simply want to gamble without time restrictions. I’m a casino dealer, and I believe there are two main reasons some casinos are always open. In turn, this translates to more profit for the casino, at least in theory. This is better for the players as if there is no closing time, they can gamble whenever they want. But most casinos in Las Vegas and London are open 24 hours a day, 7 days a week.