Related Clues:

• ''Au revoir''
• A looooong time
• "Later!"
• "So long"
• Stretches of history
• ''So long!''
• Almost eternity
• Millennia on end
• "See ya"
• "Toodles!"
• Casual goodbye
• ''Hasta luego!''
• Geologic divisions
• ''Catch you later''
• ''Bye-bye!''