Related Clues:

• Tons of time
• "Come here ---?"
• A billion years, geologically
• Very long stretches
• Almost an eternity
• Units of time
• Geological time periods
• Near-infinite timespans
• Lengthy units of time
• Incalculable amounts of time
• Stellar periods
• Long, long periods
• Quite frequently
• Quite a long time
• How long it takes canyons to form