  Blazars are the most active extragalactic gamma-ray sources. They show
sporadic bursts of activity, lasting from hours to months. In this work we
present 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 Duty
Cycle (DC): fraction of time that the source spends in an active state. The
objects 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 of
selected blazars in the ten years of data. This analysis constrains a possible
counterpart of sub-PeV neutrino emission during the quiescent states, leaving
the possibility to explain the observed IceCube signal during the flaring
states.
