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sangam vvsangam vv 

guys please help me for this trigger to calculate stage age?

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this is opportunity(custom) object i have picklist values based on this picklist value record are created in  another object that one is child object in that records are atomatically created based on stages.
Now i want calculate stage age

this in Opportunity history(custom) object
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sangam vvsangam vv
How to display No of days in stage.Please help me guys i am stuck here