Related Clues:

• They're often low for closers
• Amounts of time
• Bullpen stats
• Extra-long durations
• History stretches
• Chronology stretches
• Units of geologic time
• Geological times
• Pitcher's figs.
• Lengthy time units
• Period pieces?
• Big historical periods
• Very long times
• Named times
• Mesozoic and Cenozoic, for two