Imagine you have a dice with 1 million sides. Your chance of rolling 123,456 is 1 in 1 million, or 0.0001%. You start rolling the dice once a day. Each day the chance the dice will land on 123,456 is 1 in 1 million. That doesn't change day to day. Now lets fast forward in time 10 million days. You've rolled the dice 10 million times. Each individual roll was still a super tiny chance. But the odds that you won't have landed on 123,456 in those 10 million roles is approximately 0.0045%. (0.999999^10,000,000)

There is still a chance that you won't have rolled a 123,456 but it is very small.