When do you call "Time!"

[NDblue]

At this time in my umpiring career, I only do SP. Whenever play has stopped and the defense had control of the ball (doesn't have to be in the infield or near the pitchers rubber), I call "TIME" with my hands raised above my head. Am I wrong? Not according to all clinics and schools I've attended nor by the book. I'm going to have to reread that section in the book before doing my first FP game which will be in the next few weeks.