Bosnia's war finished in 1995 and since then the international community implemented and monitored the peace through an agency known as OHR. OHR's mandate was due to be finished in 2007. The current tensions between the different groups has led to concerns about the possible reignition of the conflict and OHR's mandate has been extended through 2009, which will be some 14 years after the peace agreement was signed (interested parties can read more about this here).
I just mention this now as I listen to the debates over the globe's current conflict zones. Peace is difficult to attain and even more difficult to sustain. It also takes a long, long time.