Let him answer it himself. That's what I was thinking, but the way he phrased it sounds like he has an extra few minutes, making 17 or 18 minutes between kickoffs. My games usually finish in 8 minutes, then I have about 4 minutes to prepare before the 3 minutes where you can't change anything. Sometimes I don't regain control of my squad until later.
I remember you saying that the minimum 15 minutes is enough time, though.