To me, that seems unacceptably long.
So, what are you willing to pay to accomplish the goal?
Technically, it's not hard -- just repeat either of the Iraq wars. But if you take just a slightly wider view, those wars were not successful in making the region West-friendly and stable, and the overall cost, in both lives and money, was very high. What makes you think another military excursion into the region will fare any better?
The second was until Obama decided to unilaterally pull out prematurely for no particularly good reason.
Here's my op-ed that uses long-term orientation, probabilistic thinking, numeracy, consider the alternative, reaching our actual goals, avoiding intuitive emotional reactions and attention bias, and other rationality techniques to suggest more rational responses to the Paris attacks and the ISIS threat. It's published in the Sunday edition of The Plain Dealer, a major newspaper (16th in the US). This is part of my broader project, Intentional Insights, of conveying rational thinking, including about politics, to a broad audience to raise the sanity waterline.