Related Clues:

• A very long time
• Time divisions
• Eternity
• Cheerio alternative
• Breezy send-off
• 'Au revoir!'
• Many, many years
• An eternity
• See you, in Soho
• "Cheerio!"
• Millennia
• "Adieu!"
• Billion-year increments
• Quite a stretch
• Eternities