Geologic Time Scale

How long ago is 4.6 billion years? If you make a time line where every inch represents 5 million years then you need a really long piece of paper, like over 75 feet!
The Alchemists made geologic time scales and soon discovered that not only has the Earth been around a long time but life on Earth hasn't been around very long at all, inches out of that 75 feet. The Alchemists are just beginning to look at all of this as they learn about the Earth's evolution.