Opportunity Duration in Opportunity progress table


I have few custom pages in opportunity workflow. The data is added to the opportunity progress table whenever the opportunity data is updated. Everything works fine except Opportunity duration. How can I insert value to opportunity duration. I am know it is a system calculated field based on business calendar defined. How to get the calculation used so that I can insert to opportunity progress table whenever a custom page is updated?

Is there any field in CRM that store the duration field? Or how can I calculate the duration time?

Any Help?

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