Cancer detection using impedance measurements

Indeed, the published documentation is silent on this issue. The sweep time depends on a number of factors, to name a few: the nature of the circuit under test, clock frequency MCLK, the sweep frequency range and number of frequency points, I2C communication speed, your microcontroller speed, etc. Assuming you are using the external 16 MHz clock, the sinewave sampling would take 1.024 ms, and, additionally. the same time will be taken by the DFT processing (from this forum communication with the ADI representative). This 2.048 ms is the minimum time per point. In addition, the circuit needs to wait after switching from one frequency point to the next at least for 1 cycle of the excitation sinewave, the duration of which depends on the frequency at a given point of the sweep, see p.25, section "NUMBER OF SETTLING TIME CYCLES" in the datasheet. If your impedance under test is a high-Q circuit - this settling time can be quite long. And, of course, the I2C communication time to send commands to the chip and read Re and Im data will take yet additional time, that you can perhaps estimate knowing the speed and workload of your specific Arduino system. Adding up all the above per each frequency point in your sweep and adding those again should give you a reasonable estimate of minimum time requirements for each of your 6 electrode combinations.