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We take into account the constraints from the observed extragalacticgamma-ray background to estimate the maximum duty cycle allowed for a selectedsample of WMAP Blazars, in order to be detectable by AGILE and GLAST gamma-rayexperiments. For the nominal sensitivity values of both instruments, weidentify a subset of sources which can in principle be detectable also in asteady state without over-predicting the extragalactic background. This work isbased on the results of a recently derived Blazar radio LogN-LogS obtained bycombining several multi-frequency surveys.

Blazar Duty-Cycle at gamma-ray Frequecies: Constraints from Extragalactic Background Radiation and Prospects for AGILE and GLAST