Measure time of operations state

Hi All
 
I have a PI tag with show what operationstate I am in. I have following operations state:
 
1) Filling
2) Producing
3) Cooling
4) Discharging
5) CIP
 
It is a batch process where I wan't how long the product is in every operation state. I want to use it every morning where I want to know how much time every filling have taken:

Start: *-24h

End: *

Filling for "PItag_Operationstate"

20 minuts

16 minuts

21 minuts

40 minuts

27 minuts

and so fort

But how do I do this?