Days Difference between two dates in same column with duplicate dates in Power BI

Anonymous 

pls provide some sample data and expected output.

Days Diff Measure : =
VAR ranking =
RANKX (
FILTER ( ALL ( 'Table' ), 'Table'[Stage] = MAX ( 'Table'[Stage] ) ),
CALCULATE ( MAX ( 'Table'[Date] ) ),
,
ASC
)
VAR result =
DATEDIFF (
CALCULATE (
MAX ( 'Table'[Date] ),
FILTER (
ALL ( 'Table' ),
'Table'[Stage] = MAX ( 'Table'[Stage] )
&& RANKX (
FILTER ( ALL ( 'Table' ), 'Table'[Stage] = MAX ( 'Table'[Stage] ) ),
CALCULATE ( MAX ( 'Table'[Date] ) ),
,
ASC
) = ranking - 1
)
),
MAX ( 'Table'[Date] ),
DAY
)
RETURN
result

https://www.dropbox.com/s/rwbkhoz3ir6d789/erp.pbix?dl=0 

Thanks for your answers...

Hi all,

please help me. I need to calculate the sum of several date time differences by different values (Case ID status code changes and it has date and time). It is complicated to explain, so please look there:

Can anyone help? thanks in advance.