Calculate downtime during working hours (ALL weekdays and a saturday!)

[Cloucl]

Hi

I have a project that requires me to calculate the downtime of a machine only during working hours but I cannot include Sundays and holidays. Doing it manually is one way but is there any formula that I could use?

Weekdays working hours :
6am to 7pm

Saturday working hours
7am to 2pm

I need to have both start date and time in a cell and the end date and time in another cell

 

[Cloucl]

I have to convert the downtime into minutes also