If I select at my dish washer:
- A fixed-time program, it displays 2:20 in the beginning and it runs for exactly 2:20
- An auto program, it displays 2:45 and runs for 2:15 to 2:45 so difference is < 20%
The variation is never in plus meaning that it never runs longer than initial display time.
If I select at my washing machine:
- A cotton program, it displays 4:20 at the start then goes to 2:36 after 10 minutes, but actually can wash between 2:00 and 4:00
- A silk program, it displays 3:35 in the beginning then varies with values, but runs for 1:00 to 5:00 hours.
The variation is many times in plus. The most weird scenario was when it showed 2:00 at 8 pm, but ended its whole cycle at... 2 am meaning that it run for four more hours than predicted.
The above was checked / tested / confirmed on many nowadays and modern dishwashers and washing machines, from many suppliers, including Bosch, Candy, Beko, Whirlpool and many more.
What am I missing? Why modern devices of a one kind can predict running time with the precision to 5-10 minutes while devices of other kind have variations to up to 200-300%? Especially given the fact that boths kinds of devices are doing pretty much the same, i.e. using water and cleaning agent for washing either dishes or clothing.