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Measure for Distinct Counts of days employees worked

Good Afternoon all, 


Please need help on solving this one !!!! 


I have a table iin_costs that has a list of all the hours employee's worked over a date range. They do a number of tasks throughout the day and there is more than three employees (but for the example i have just used three). 

iin_users.namereference dateHours worked Task
John Smith22/11/213.51
John Smith22/11/2112
John Smith22/11/2112

Rebecca Smith

Rebecca Smith22/11/2123
Wayne Smith22/11/213.51
John Smith23/11/213.51
John Smith23/11/2112

Rebecca Smith

John Smith24/11/213.51
John Smith24/11/2112

Rebecca Smith

Rebecca Smith24/11/2123
Wayne Smith24/11/213.51
John Smith25/11/2112
John Smith26/11/2112
Rebecca Smith26/11/2123



What i would like is a measure so that i can display it on a card and to use for various other calculations that will display the number of employees that were working over any given date range (which will be a silcer) 


Eg. for the dates 22/11 through to 26/11  the number of employees that worked were 11 (John Worked 5 days, Rebecca Worked 4 days, Wayne worked 2 days)


I have tried this 

Measure = CALCULATE(DISTINCTCOUNT(iin_costs[reference_date]),  GROUPBY(iin_costsiin_costs[reference_date],iin_costs[]))
But that does not give me the count of the number of days John worked + the number of Days that Rebecca worked + the number of days Wayne worked. 
It just counts the distinct days that any person showed up for work which is 5. 
How do i get to count the number of days my distinct employees worked per employee then summed?
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