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You may want to look at creating your own custom field to the historical values.
Using workflow rules and field updates you should be able to keep track of the prior stage, the new stage and the date/time stamp when it occurred.
Because the fields are stored on the opportunity level and not the opportunity history level you will only ever have one entry. Every time it changes it will overwrite the previous values. You then just run a normal opportunity report. The behavior will be different to the history report.
This solution is not retroactive and will only start the tracking process once you activate the rules.