Possible Clues:

• Day fractions: Abbr
• Time sheet abbr
• Time-card abbr
• Four-baggers: Abbr
• Nos. on a shop door, often
• "48 __"
• Day's two doz
• "48 ___" (Murphy film)
• MLB set a season record for them in 2017
• "48 ___" (film)