How long did the precambrian last?

Answer 1

There is some debate among experts, but it is generally accepted that the Precambrian lasted from 3.9 to 4 billion years. This time period is made up of three eras which are the Paleoproterozoic, the Mesoproterozoic, and the Neoproterozoic era.

Answer 2

The Precambrian accounts for 88% of geologic time. It spans the time from Earth's formation about 4600 million years ago to the beginning of the Cambrian Period, about 541 million years ago.