I don't quite understand the scenario either, but I don't see it as an issue. Perhaps if the child is already behind in their schooling then it would be an issue.
I was out of school for 3 consecutive months in grade 5 when our family travelled around Australia. Was the BEST experience and even though I was only 11 at the time I remember lots of it. I remember even going and seeing the "School of the Air" and listening in a bit. That was interesting.
I was also out of school for 3 consecutive months in grade 6 when our family travelled around Europe - again, it's stuff you can never compare school to.
And what did I choose to do when I left school - go to Uni. What profession? Teaching!
In school you can read about it in books, but living it is entirely different. The culture, languages, literacies (reading signs, visiting museums, writing journals, postcards, talking about the things you see and gaining a greater vocabulary and repetoire), maths (how much should it cost? What time would we need to leave?)... it really is the experience.