User blog comment:Reikyu/Twinkle Little Star Shell/@comment-25779449-20150530161106

Someone did 2 star shell tests last year. The outcomees were pretty similar (~67% for the 1st ship, ~67% for the next)

http://kancolle.wikia.com/wiki/User_blog:Homuhomu123/Trigger_Rates_of_Night_Battle_Cut-In#III_-_Starshell_.26_Cut-In_Chances

http://kancolle.wikia.com/wiki/User_blog:Homuhomu123/Trigger_Rates_of_Night_Battle_Cut-In#IV_-_Combined_Effects_from_Searchlight_.26_Starshell