Clue: Billion-year stretch

Answer: EON

Length: 3

---

Similar Clues:

• Ten-year stretches (DECADES with 7 letters)
• ''Billion Year Spree'' author Brian (ALDISS with 6 letters)
• Two-year stretches (BIENNIA with 7 letters)
• A billion years, to Hubble (EON with 3 letters)
• Billion years (e.g. AEON with 4 letters)
• A billion years, in geology (EON with 3 letters)
• One billion years (Var.) (AEON with 4 letters)
• A billion years, to geologists (EON with 3 letters)
• Billion years, to a geologist (AEON with 4 letters)
• One billion years, in geology (EON with 3 letters)