A test tube, 15 mm in diameter and 15 cm in height, half filled with ethyl acetate (A), was kept open to air (B) in the laboratory. Determine how long it takes for the liquid level to drop to one-third of the height of the tube. Assume the temperature is 25C and the ambient pressure is 1.013 bar. 

Data: the vapor pressure of ethyl acetate at 25 C is 0.1264 bar, its diffusivity in air under the given conditions is DAB = 0.0866 cm/s and the density of the liquid is 900 kg/m.