with my 2 10 ft chains in a good 15 mph wind I can keep my boat between .5 or so all the way down to sitting completely still. Usually if i have my chains out its because the wind is pushing me to fast with my socks. .2 is what I shoot for most of the time and I can achieve that very easy with 2 10 ft 3/8 log chains. Depends on boat size, weight, and design also. My boat is a 18/60 wareagle.

