time delay up to 24 hours. if you use a manual control, press the round arrow key to start spinning. i feel that they are truly my teachers as much as i can hope to be theirs. the growth of these fish was also above average for lakes in the area. it can’t get cheaper than this, can it? we try to help each other and i try to help in the best way i can. a good non-chemical analogy is two people on a see-saw. if you want them to learn about it in school then send them to a private school. 