The pre-clean mode takes up to 5 minutes because it is automated and checks the amount of water and temperature. The exact length of the pre-clean cycle therefore depends on the starting temperature. Sometimes, the duration decreases right after you start the mode.
Pre-clean mode really takes the hassle out of cleaning, but you don’t have to run it every time the device is set up. Nevertheless, there are some recipes where it is very helpful to have this smart, automatic pre-clean control available, which adapts to the leftovers and their consistency in the bowl.