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Blazars are the most active extragalactic gamma-ray sources. They showsporadic bursts of activity, lasting from hours to months. In this work wepresent a 10-year analysis of a sample of bright sources detected by Fermi-LAT(100 MeV - 300 GeV). Using 2-week binned lightcurves (LC) we estimated the DutyCycle (DC): fraction of time that the source spends in an active state. Theobjects present different DC values, with an average of $22.74\%$ and $23.08\%$ when considering (and not) the Extragalactic Background Light ( EBL).Additionally we study the so called "blazar sequence" trend for the sample ofselected blazars in the ten years of data. This analysis constrains a possiblecounterpart of sub-PeV neutrino emission during the quiescent states, leavingthe possibility to explain the observed IceCube signal during the flaringstates.

Study of Blazar activity in 10 year Fermi-LAT data and implications for TeV neutrino expectations