Well, there was no ottoman macedonia. What is refered to as the regional Macedonia most often is the enlarged roman province of Macedonia, during Ottoman times this region were in fact 3 different regions.
As for expiration, it won't expire as there is no time limit to treaties as they are replaced by new ones or ripped up through war. And further the treaty of Bucharest is irrelevant due to the first world war and the treaty of Versaille replacing it.