10" lines? Maybe on long lines, but prefer 24". Normal decoys, I have shortened most of my lines as I never really hunt anything deeper than 8' anymore. If I do hunt deeper spots I run long line set up's and will run up to 10 long lines. Depends on the situation. If your going to be hunting all over 15' should cover you for most locations. 4oz-8oz will cover you for most hunting conditions unless you deal with high wind, fast current or ice. Then you may need more weight. I have ran up to 12oz for goose floaters. Or 5-10 lbs for long lines at each end.