Possible Clues:

• "Too many cooks ...," e.g.
• 'He who hesitates is lost,' e.g.
• "Time is money" is one
• It's very familiar
• Chestnut
• Bromide
• Saying for a long time
• Time-honored maxim
• 'Don't count your chickens before they hatch,' e.g
• Wise chestnut