def calc_RC_via_bulk_time(capacitance, L, sigma):
    """
    Characteristic time for induced double layer to form considering a capacitance.
    units: s
    Notes:
        Squires, 2010   -   "characteristic time for induced double layer to form"
    Inputs:
        capacitance:    F/m^2    C^2*s^2/kg/m^2/m^2       (total capacitance of double layer system)
        L_bpe:          m        m       (characteristic length of BPE)
        sigma:          S/m      C^2*s/kg/m^2/m       (conductivity of electrolyte/buffer)
    Outputs:
        tau:            s
    """
    tau = capacitance*L/sigma
    return tau