If I'm on the river and have to hump them in, I only use as many as we can carry in one trip. If I can drive to my spot on the lake, pond or river I use all I got.I'll run mine early in the morning and take them down when the sun starts hitting them good. If its cloudy I'll run them as long as we stay. I got a good deal on some this year so I have a total of six. How many do you guys use and how do you use them. Any secrets on robo ducks ya want to share?