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SesameStreetSesameStreet 

Report that shows average time from a certain opportunity stage to the opportunity closure

Our opportunities are managed through numerous stages, and we'd like to measure the average time it takes from a specific stage (i.e. Proposal/Price Quote) to the opportunity closure.
How is that done?
I have tried adding a customized summary formula to the "Opportunity Stage Duration Report" but was unsuccessful at building the required expression.