Possible Clues:

• Coll. units
• Divs. of a day
• Twice-daily dozen (Abbr.)
• Time divs.
• '48___' (Nick Nolte film)
• Storefront-sign abbr
• There are 168 in a wk
• Meas. of time
• 9 to 5, say: Abbr
• More than mins