I think most children when young are ok with doing full time hifz, especially if they are in a supportive environment i.e. there are many other kids their age also doing hifz, they don't feel left out or lonely that way. When they grow up a bit, into their teens, they start developing their own ideas. Therefore it's good to have him do hifz while still young.
My personal advice would be to have him continue part time (ya'ni during school but also after school on your own etc) until he is about eight or nine, or even ten or so.. whenever you feel that he is mature enough to be able to handle it. Ten or eleven should be the max. I've seen many parents send children to full time madrasa when they're too young, which results in the ustadh having to babysit most of the time instead of really teach.
He can take a year or two off and then skip back to his original level class. It's very easy to do with the lower level grades.
As for moving to Saudi, I grew up mostly there and did my Hifz there, and I don't have any qualms recommending it. It's a different experience altogether than growing up in a non Muslim majority country. Really brings in an Islamic identity (if parents provide a good upbringing).
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