Well, I recently heard (perhaps twice) that it was expected in Israel for parents to teach their children.
Sunday school wasn't ever mentioned.
I do think that it is a large time investment and some parents may not be the best teachers or they may be quite lazy.
It makes sense to me that the endogenous skill exists within all parents but the culture has sort of culled this to some extent consciously.
I have no children and wasn't homeschooled mostly. The one time I finally convinced my parents that I should be homeschooled I was able to finish a week of schooling in a day. Unfortunately, due to the lack of structure, this was an excuse for me to just waste time with games/TV, etc.
Thinking back, had my parents even known how to teach me or connected me with good teachers/tutors, I'm sure I would have loved to fill in this extra time. It's still a sore point to me even now so I won't get too deep into that...but it does really depend on the child and their needs.
Not that you shouldn't do it, just consider each child as needing a different curriculum.
For one, it might be a monumental achievement at the end of 12 years for them to get their diploma or GED.
For another, it would be quite ridiculous if that was all that was accomplished during that time. Dual enrollment with colleges is a thing (another lament)...this should be seriously encouraged with any child that has the aptitude. General education courses in college are a joke, easier in fact than some high school courses (honors or AP)
I won't go too much into my own personal "what ifs" but if a child is exceptional at taking tests and retaining information and absorbing it...consider CLEP
This is NOT mentioned in schools anywhere that I know and that is quite a shame.
Essentially you have to be 13 years old to take these tests but they are quite simple if one is a good test taker. It's really cool and I appreciate this thread because this may actually be an option for me with all the difficulty I had with schooling. It would've been nice to be 18 and have graduated college already to the tune of $4k but still this put it back on my mind and testing is one of the things I'm proficient at but couldn't figure out a way to use that skill.
There are homeschool groups that share the load between parents. That's a great option and also pretty realistic. It will probably take a while to figure it out, but reading from a textbook in the meantime isn't unreasonable. I myself enjoy reading textbooks and checking comprehension and being creative with how to teach someone teaches you at the same time. I do get that not everyone is geared that way, but I think we all teach in some fashion. Focus on your strengths and what you need assistance with (as a parent of a homeschooler).
Definitely a worthy pursuit. Certainly 8 hours a day is an absurd waste of time with standardized education, but 8 hours a day for learning is not unreasonable. Find out what they want to learn first and then encourage them with wisdom on what they need to learn but don't want to. If public school is any example, you can't force children to learn what they have no desire to quickly. It certainly sucked up a lot of my life and was probably the single most stressful episode.
Anyway, cool thread.