How much of Earth’s geologic history does Precambrian time represent?

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A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years. — Precambrian The stratigraphic chart of geologic time.

Precambrian time represents more than 80 percent of Earth’s total geologic record. It extends from the formation of Earth approximately 4.6 billion years ago to the beginning of the Cambrian Period 541 million years ago.1