Need help with custom report

Need help with custom report

I can easily track a resolution SLA from my MSP ticket data using Analytics. I am trying to create a report on another custom SLA that MSP can not create, We have a ticket status called Proposed Resolution. This status does not resolve the ticket. Some customers have a resolution SLA till this status in a ticket. I am using the Status History table to create a report that looks 

So the only request status I am interested in are Open and In Progress. Once a ticket status becomes Proposed Resolution I stop tracking and add up all the time a ticket was in these two status. My problem is I only want to track against operational hours. I need to exclude the weekend hours.How do I exclude weekend hours?

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