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The time span of Cenozoic Era was 66 million years to 0 million years ago, while it's duration was approx. 66 million years.

The time span of Hadean Eon was 4,567.3 million years to 4,000 million years ago, while it's duration was approx. 567.3 million years.

The time span of Archean Eon was 4,000million years to 2,500 million years ago, while it's duration was approx. 1500 million years.

The time span of Proterozoic Eon was 2,500 million years to 538.8 million years ago, while it's duration was approx. 1961.2 million years.

The current Eon is the Phanerozoic Eon. It's time span is 538.8 million years to now. It's duration is 538.8 million years.