Talk:Units/@comment-5520654-20121024124537/@comment-5275528-20121024142337

There is no limit. Did you fight against the same enemy formation? Did you fight using the same units on your side? Did you fire once from each unit one time and not the second time?

You need to look at the total SP that you got with no boost across all units in the battle and compare that with the total SP across all units with the boost. I've bought the boost several times and it has always worked as expected.