Theis Method plot drawdown vs. time for 4 observation wells, 5, 50, 100, 500 meters from well pumping at constant rate of 300 m^3/day in sandy confined aquifer. b=12 m, K=25 m/day, and S=10^-4. Given that depths to water in wells can be measured with an accuracy of about 0.5 cm, how long does it take to reach near-steady conditions?