What is the answer to "1,000,000,000 years" in the NYT Crossword?

The answer to the NYT Crossword clue "1,000,000,000 years" is EON (3 letters).

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NYT

1,000,000,000 years NYT Crossword Clue

Across clue · from the September 13, 2026 puzzle

Stuck on “1,000,000,000 years” from the New York Times Crossword? Here is the verified answer:

Answer

EON

3 letters · Across · last seen September 13, 2026