I had to reply, because my 4 yo is nurturing her Dreambox obsession as we speak. smile how much time is ok? I mean, he is making incredible progress, and if it's balanced with the rest of his life, you know what is right for own child. The average kid in the US watches 4 hours of tv per day, and I doubt the principal is lecturing those parents.

I tend to avoid confrontation, so if it were me, I'd probably let the insult go, and just ask the math specialist if she has any other resources to recommend so that he learns in other ways too.

My daughter does well if I explain official recommendations. For example, the AAP recommends 2 hours or less of screen time, so you can play for 2 hours.