Related Clues:

• Pitcher's no.
• A looooong time
• Forever, facetiously
• Eisenhower years, e.g.
• Swing ___
• A cause for Steinem
• Failed const. amendment
• 1 billion years
• Temporal stretch
• McCarthy, for one
• 365 billion days, astronomically
• Interminable stretch
• Almost eternity
• Longish span of time
• Millennia on end