Performing a fatigue threshold test using manual load controls in a servo hydraulic testing machine can be an extremely time-consuming task. Calculate the minimum number of days required to determine the threshold stress intensity factor range, ?K0, of a material at a cyclic frequency of 1 Hz, if ?K0 is defined as the threshold corresponding to a growth rate of no more than 10-11 m/cycle and if the resolution of the crack detection technique is 0.05 mm.