When did Precambrian time begin and end?

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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 began approximately 4.6 billion years ago, marking the formation of Earth, and ended 541 million years ago at the beginning of the Cambrian Period.1

This vast interval, which represents more than 80 percent of the total geologic time record, is formally divided into the Archean Eon (roughly 4.0 to 2.5 billion years ago) and the Proterozoic Eon (2.5 billion to 541 million years ago). Additionally, the Hadean Eon is recognized as an informal interval spanning from 4.6 billion to 4 billion years ago.12