Business_hour (by minute)

Business_hour (by minute)

Hi Zoho Team
business_hours formula can only give the difference of time or day between two dates. (In the time calculation, it can only calculate the exact time. For example, it can give the difference between 16:30 and 16:55 as 0.)
I want to calculate the minute difference between the two dates by specifying the working hours.
How can I calculate the difference in minutes using this formula.
Thanks