We home schooled for about 10 years before my wife died of cancer.
The most eye-opening fact is the amount of time that is NOT NEEDED for a child to actually learn something.
I left for work earlier than school, so I never saw the start of a school day, but my wife said they started around 9 and was don by by 12 or so.
The rest of the time was ALSO in school .. shopping trips,f'rinstance, became combined geography and math class with some science thrown in to describe lake effect (all legal and accepted in Pennsylvania's school system .. which still checks out HS to a degree)
Keep a record and a log of times spent in conversation about anything you discuss or just tell a child and it is considered 'education'
Likewise for us. A couple hours were all that was needed to actually do the academics.
I've had teachers tell me that on a good day, 50% of the classroom time is wasted time, discipline, lining kids up, getting ready for the lesson, sharpening pencils, getting kids focused, etc. On a bad day, 90% is wasted time, only 10% is on actual learning.
So, homeschoolers are likely actually spending the same amount of time in actual instruction, but the kids aren't being forced to endure all the down time the other kids cause.
But then when you dig deeper, you realize that even those hours are typically a reflection of the curriculum devised by Rockefeller and Carnegie, which has little to do with anything important.
What's important in life is being good and seeking truth.
The methodology of schooling is antithetical to both. The real lessons of schooling are... The Seven Lesson Schoolteacher.