Supposedly Iraq has about 150K trained forces. We need to get em up to 271K. We do about 80K per year. There's your exit strategy. Maybe by this time next year, we'll be bringing some troops home.
The Iraqi security forces now consist of about 170,000 trained and equipped soldiers and police. If 270,000 is the goal, we only need 100,000 more. That would be about one year and several months to go.