I knew a professional anthropologist that raised a couple of kids while doing extended field work in the Amazon basin. They got maybe an hour or two a day of formal instruction during their grade school years. When they returned to the US, they tested at well above grade level and had no trouble adjusting.

I’m sure there was a big emotional adjustment to the endless hours in a classroom after being able to play in the trees most of the day, but they grew up and got established in their professions unusually quickly. I suspect it was due to the enriched social environment provided by having cool ass parents.