I often read teacher's message boards, for new ideas to use in our homeschool. The "A to Z Teaching" link at the top of this board is awesome...you should check it out if you haven't.
Anyway, I was reading the fifth grade board over there because my oldest is heading into 5th, and that's uncharted territory for me!

I opened the thread about what to do the first week, and read these comments:
~"I think that the first few weeks of school is all about procedures/routines/rules etc. I typically spend 6 weeks on this stuff."
~"After finishing my first year in 5th grade, I have learned that this following year I will spend MUCH more time on procedures, routines, and rules. I would not recommend jumping into the curriculum until you have thoroughly established these things."
~"I normally do procedures/routines with a few get to know you activities thrown in to break up the monotony. It's also key to model EVERYTHING. Don't take for granted that 5th graders know how to line up etc."
~"I usually spend the first week doing community building activities, getting to know you games, and we spend TONS of time on procedures and rules."
Now, I'm not knocking the teachers. I taught art in a private school for a year, and I understand how necessary it is to have good classroom management. However, I didn't realize it could take SIX weeks to instill this kind of stuff in a
fifth grade classroom?! (Other teachers do chime in and say that they don't devote anywhere near that much time to rules, etc. before delving into the curriculum.)
I'm just sharing that because reading it has given me a whole different perspective on the efficiency of homeschooling....and on my state's mandatory rule that we devote 4.5 hours to academics each day. At home, we don't really have to waste any time on rules and procedures because the kids already know them.