Our L6s train 9-12 hours max (those doing 12 are playing catchup). Even our L10 (who, by the way did future stars all the way until he aged out and placed well frequently) doesn't do more than about 16-18 hours at MOST....we have several 9YO L6s, no 8s, and they sometimes miss a day due to burn out.
DS 14 yo is doing the max our gym offers (16 hours) to make L8 (from L5) - he's hit puberty and can really benefit from more hours with conditioning and work ethic. but even with that he's had times he had forearm splints from too much mushroom, his hands are chopped meat right now from working all week to get both front and back giants last week, and he's eating like a horse...the coach says jump and he says "how high and can I try again"....younger kiddo (one of the 9 yo training L6) is working hard but peters out at about 12 hours a week and has more "are my hands too sore to go on?do I need another drink?is it really my turn again? moments...
From everything I know about MAG and about boys physical maturation (I'm an MD) your kiddos hours sound way out of the norm even for kids on an elite path - and possibly dangerous....likely unnecessary....even with the girls that would be on the high end, and their maturation path and skill set are very different....with lots more stuff that can be perfected in a pre-pubescent kiddo...still many burn out in those intense programs...
Why would a boys program do this? (As in perhaps there's a reason I am unaware of?)