[Beatrix]

Quote bread_baker

If it was up to me, I'd change it to 1.5 hours, 2 times a week. A boy that young may have a hard time focusing for 3 intensive hours. If the mother is determined to keep the original schedule, see if she will let him take a 10 or 15 minute break between the first and second halves.
Definitely give him a variety of activities, and include some hands-on and visual ones.

I would make an one-hour break (by playing games, etc)
but I still think the child would be too tired after two hours and unable to concentrate on anything new.