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The relaxation time of the interacted electrons, namely quasiparticles, is scaled with the Planckian time, $\\hbar/k_{\\rm B}T$. However, there is a debate over whether heavy-fermion systems can obey the Planckian time. In the optical conductivity spectra, the Drude response will appear as the scaling of $\\hbar\\omega/k_{\\rm B}T$ as the dynamical Planckian scaling (DPS). 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