A method of setting an estimated electrolyte solution impregnation time of a measurement target full cell of a lithium secondary battery, the method comprising steps of: forming an electrode material mixture layer having a thickness of 10 μm to 200 μm, a porosity of 18 vol% to 30 vol%, and a density of 1 g/cm 3 to 4.5 g/cm 3 by coating a perforated foil with an electrode active material slurry and rolling the coated foil (S1); preparing a non-aqueous electrolyte solution (S2); dispensing 1 μL to 10 μL of the non-aqueous electrolyte solution on a top surface of the electrode material mixture layer and calculating an electrolyte solution impregnation rate by measuring a time at which the non-aqueous electrolyte solution passes through the electrode material mixture layer (S3); and setting an estimated electrolyte solution impregnation time of a measurement target full cell using the electrolyte solution impregnation rate (S4); wherein the electrolyte solution impregnation rate is calculated using Equation 1: Impregnation rate μ m / sec = electrode material mixture layer thickness μm / time sec from a time of dispensing the electrolyte solution on the top surface of the electrode material mixture layer to a time of the electrolyte solution reaching a bottom surface of the electrode material mixture layer ; and and wherein the estimated electrolyte solution impregnation time of the measurement target full cell is set using Equation 2: Estimated full cell impregnation time hr = 0.0086 mm − 2 × electrode thickness μm × electrode area mm 2 ) 2 electrolyte solution impregnation rate μm / hr wherein the estimated full cell impregnation time denotes the estimated electrolyte solution impregnation time of the full cell, and the electrode is a positive electrode or a negative electrode. forming an electrode material mixture layer having a thickness of 10 μm to 200 μm, a porosity of 18 vol% to 30 vol%, and a density of 1 g/cm 3 to 4.5 g/cm 3 by coating a perforated foil with an electrode active material slurry and rolling the coated foil (S1); preparing a non-aqueous electrolyte solution (S2); dispensing 1 μL to 10 μL of the non-aqueous electrolyte solution on a top surface of the electrode material mixture layer and calculating an electrolyte solution impregnation rate by measuring a time at which the non-aqueous electrolyte solution passes through the electrode material mixture layer (S3); and setting an estimated electrolyte solution impregnation time of a measurement target full cell using the electrolyte solution impregnation rate (S4); wherein the electrolyte solution impregnation rate is calculated using Equation 1: Impregnation rate μ m / sec = electrode material mixture layer thickness μm / time sec from a time of dispensing the electrolyte solution on the top surface of the electrode material mixture layer to a time of the electrolyte solution reaching a bottom surface of the electrode material mixture layer ; and and wherein the estimated electrolyte solution impregnation time of the measurement target full cell is set using Equation 2: Estimated full cell impregnation time hr = 0.0086 mm − 2 × electrode thickness μm × electrode area mm 2 ) 2 electrolyte solution impregnation rate μm / hr wherein the estimated full cell impregnation time denotes the estimated electrolyte solution impregnation time of the full cell, and the electrode is a positive electrode or a negative electrode. <EOS>