Related Clues:

• Prolonged period
• L-o-n-g stretch of time
• Looooong time
• Many millennia (Var.)
• Extremely long time period
• Geological era
• Big stretch
• Time without end
• Quite a long stretch
• Wait at the motor vehicle bureau, say
• It's a big stretch
• Long geological time
• Longest time
• Indefinitely long time
• Huge time stretch