It is.The prompts every time in that minigame is infuriating,
That and the camera keeps resetting in the upper left corner when the unit you need to move is in the lower right. I've started moving all of my units together in the top left corner just so I don't have to continually scroll every time they need to attack. It speeds things up a bit.
What I've been doing is getting the six stones from the tutorial, and then completing the first three missions for another four [three + one for the completion reward]. It gives me two rolls at the gatcha per re-roll, and only requires an additional three minutes or so [out everything on 3x speed and Auto Battle]. The tutorial is easily the worst part.