  The end of inflation is connected to the standard cosmological scenario
through reheating. During reheating, the inflaton oscillates around the minimum
of the potential and thus decays into the daughter particles that populate the
Universe at later times. Using cosmological evolution for observable CMB scales
from the time of Hubble crossing to the present time, we translate the
constraint on the spectral index $n_s$ from Planck data to the constraint on
the reheating scenario in the context of K\"ahler Moduli Inflation. In
addition, we extend the de-facto analysis generally done only for the pivot
scale to all the observable scales which crossed the Hubble radius during
inflation. We study how the maximum number of e-folds varies for different
scales, and the effect of the equation of state and potential parameters.
