Ten weeks is the way to go. The Corps packs a lot of crap into those ten weeks. But none is personal. As long as he is in good condition for the pull ups and running he should be good. Having skin is helpful too. When the classes are full like that surviving the first direct encounter with the staff is key. You may not have another direct encounter for a week. Helps one get over the culture shock.
He's maxed out on crunches and has the minimum required pull-ups — maybe one or two extra but the candidates all said practice not sleeping or eating and having you're stuff so you can put it on in the dark, find it in the dark, shave in the dark. Two minutes to get ready is all he'll have. Now, from my standpoint as his mother, THAT will be the miracle. ;-)