However, there is no evidence to suggest that slot machines are programmed to pay out differently at specific times of the day. The outcomes of each spin on a slot machine are determined by a random number generator, so each spin is independent and not influenced by the time of day.
There is no evidence to suggest that the odds of winning at slots are affected by how crowded a casino is. Slot machines operate on random number generators and are regulated to ensure fairness, so the number of people in the casino should not impact your chances of winning.