Auditing Manage Expense Report ‘Days In Queue’ Column - Can it be set to calculate working days?

Summary:

We're trying to establish a way to measure the time take to audit expense reports. 'Day in Queue' would have been a possibility but it's currently counting calendar days and we'd like it to calculate on business working days. Is it possible to set this field to count business working days?

Content (required):

Navigation: Auditing > Task: Manage Expense Reports > Search Results > Days in Queue

In the Auditing Manage Expense Report form (search results), there is a column called ‘Days in Queue’.

Does anybody know if this field can be set to calculate working days. It is currently calculating calendar days.