In a very simple calculation:
Members of Da'ash Protected content .
An average of 20 raid/day kills between Protected content - an average of 7/day.
In addition to Protected content - an average of 10/day as a collateral damage!
This means ( without any disruption of the coalition forces raids)
11 years, 7 months and 4 days Protected content victims are required to eliminate Da'ash .......
I'm just trying to make it easy for me to understand why Obama said it takes years to eliminate the dumbest organization in history!