I've been recording some stormy nights on my Canon EOS 80D, making use of its built-in timelapse function. Exposure settings varied between 4" f/3.5 ISO 800 and 30" f/3.5 ISO 3200. Dead time between exposures was between 1 and 5 seconds.
This built-in function makes no shutter actuations. It simply locks up the mirror and lets sensor exposed for the determined lapse of time.
I wonder if the sensor is turned on and off once and again to take the programmed exposures. If so, would these kind of timelapses, done frequently, reduce sensor's lifetime or affect its performance?