Outdoors I use anywhere from about 30' to 75' (50lb.) for my 1.5 sul's in 0 to about 3-4 mph winds.
If I use a standard 1.5 w/2 wraps I'll go up to 100' of either 50 or 75 lb. line.
fwiw I also have a Sedgwick 1 (w/2 wrap) and a Robertshaw 1 (w/race) I fly on 50 to 100' (50 or 75lb.) in low winds.
Sorry teamster types...I don't like the 120' lengths and it (teams) never interested me anyway. I used to do pairs with my partner from time to time but she's not really into kiting anymore...which is a drag because she was better than me...or maybe that's why...
I have a 0 wind rev coming and will do some experimenting as well. Indoors I'm a deca fellow.