The new Constitutional Court Act of Serbia incorporates constitutional appeal and its special category – 'constitutional appeal in case of violation of right to a trial within a reasonable time' - into the Serbian legal system. The reason for incorporation of this special category of the constitutional appeal was to provide the efficient legal remedy for citizens of Serbia. This was needed in order to harmonize the national system of human rights protection with the standards of protection deriving from the European Convention for Human Rights and Fundamental Freedoms. The European Court for Human Rights found in many cases, and especially in the judgment in V.A.M. v. Serbia case, that as the result of the lack of an efficient remedy for trial within a reasonable time, Serbia does not have any relevant mechanisms of human rights protection that could secure the implementation of right to a trial within a reasonable time, guaranteed under the article 6 of the Convention. The constitutional appeal and the constitutional proceedings similarly to those introduced in Croatia, should combat this systemic violation. The capacity of the present Constitutional Court of Serbia brings into doubt the sustainability of this legal remedy under the circumstances of extensive use.