Related Clues:

• Many, many years
• Pliocene, e.g.
• Geologic time division
• Amazingly long time
• An eternity
• Important age
• Longish span
• Important period
• DMV wait time, seemingly
• Nonspecific duration
• Quite a stretch
• Extended time
• Vast expanse of time
• Boundless time
• Geologic time unit