You can use the 'Business Hours Age' field to determine case age, once you understand how it is calculated.
Note: You must first Enable the Case Duration/Age in Business Hours feature before the 'Business Hours Age' field will be available. Environments for which the default Business Hours are set to 24/7 will not be able to use the Business Hours Age field in Reports.
How "Business Hours Age" is calculated
(number of business hours case has been open) / 24 hours in a day = number of days case has been open
For example:
Case opened: 7/14/2016 at 2:00 pm
Case closed: 8/4/2016 at 2:00 pm
Case business hours: Monday - Friday 8am-5pm (9 hours per day)
Total Business Hours: 126 (14 business days * 9 hours per business day)
Total Business Days: 5.25 (126 hours/24 hours a day) <<<<<<BUSINESS HOURS AGE
See also:
000382808

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