Our son has like 6 hours & 30 mins of school time & 1 hour for football class.
On top of that, 1 hour of writing class.
On Saturdays - I give him training for typing on computer & also take computer classes. He is learning how to use paint & browser. He uses turtlediary.com when he is with me in front of me for computer classes.

He is just 5 years old & he has to learn Gujarati (language we speak), Hindi, Marathi (State & Nation level language), French, English - of course not full but basics but still - it's toooooo much for him.
Even At this age, I only know just 3 - Gujarati, Hindi & basic English.

And oh boy, he has this Miko - https://miko.ai/ & does spend really good amount of time on that as well.
By 8 or 9 pm he crashes to bed.

I am amazed by the busy scheduled that he has & sometimes I think that he has no time like your son to go out & play in open at all. But yes, grass is always greener on the other side.