Our goal is to close cases within 48 hours.  Any idea how we can create a formula field that will incorporate weekends and holidays so reps are not penalized for closing cases that are opened on Friday evening or Holidays?

The field needs to be displayed in hours.  

Our business hours are listed below: 

SaturdayNo Hours
SundayNo Hours
Monday9:00 AM to 6:00 PM
Tuesday9:00 AM to 6:00 PM
Wednesday9:00 AM to 6:00 PM
Thursday9:00 AM to 6:00 PM
Friday9:00 AM to 6:00 PM