To determine the ability of the ACS in quick monitoring and in setting the required adjustments for the whitening machine, in each test run, the spent time from the onset of sampling to the moment of final adjustment by the ACS was measured and compared with the time spent in the traditional method (by the human operator). For this purpose, an investigation was performed in modern rice mills to determine the time required for a human operator to control the whitening machine performance. It was found that for each monitoring, the operator performs three important stages including: (1) sampling, (2) quality assessment of the sample, and (3) making the required adjustments related to the position of the pressure control mechanism. The spent time for performing each stage was measured several times using a digital chronometer. For measuring the corresponding times in the ACS, the spent time in each stage was determined by inserting a time calculator function in the control program. Speed of the ACS in controlling the performance of the whitening machine was then calculated using the following equations: