From time to time I hear some religious people believe the earth was created in 6,000 years. I was never taught that, but I can see where it comes from.
One day God, who can do anything, announces a plan to build the earth. He lays out the plans and says that it should be done in 6,000 years. Then, having other things to do, he turns the earth project over to his angels. I don't know how many angels there are, but let's assume it's a bunch. The first thing they do is look at the plans. Since they are God's plans they look great. The angels get to work. They start by organizing themselves into appropriate committees. Planning committees, review committees, supply committees, and relevant sub-committees, then boom! 4+ billion years later the project is done.
Now, scientists might estimate that the world took 4 billion years to organize, I might know the world has 4 billion years on the clock, and the angels must know that the world took 4 billion to build. But if anyone asks how long it took, nobody wants to argue with the boss' announcement that it was a 6,000 year project.