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E. 70, 021506 (2004)] popularized the \"RC\" timescale $\\lambda_{\\textrm{D}} L/D$, with $\\lambda_{\\textrm{D}}$ being the Debye length, $2L$ the electrode separation, and $D$ the ionic diffusivity. For thin electric double layers near concentric spherical and coaxial cylindrical electrodes, I show here that equivalent circuit models again predict the correct ionic relaxation timescales. 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