We have eight kids, seven home school, one is a commuter at a local university.
Our days vary. I have a five year old son who is kind of Asperger-y/Autistic-y and although he's making pretty good progress in learning, he doesn't sleep well. So I'm up until the wee hours with him waiting for him to drop over, and doing Montessori with him when he can focus on it.
Blessedly, I have a 15 year old daughter who gets up with the three year old so I can sleep in. She does her studies and gets the littlest some breakfast so I'm not a drooling veggie from no sleep (as one is going to bed by 3 the other waking up by 6) She likes being done with her work early because it leaves her time to pursue her passion, which is baking from scratch.
The sixteen year old son is of the personality type that needs to be pried off his bed with a crowbar and WD-40 and will maintain a deathgrip on any electronic device he holds onto, but even he manages to get his work done by the end of the day. Most of the time.
We have had years of unit studies, especially when there were only 5 kids all learning at elementary levels, but when some kids began higher grade levels it was much more difficult to manage that. There were too many kids doing too many different subjects for me to keep everything in order to do unit studies. I'd say the only subjects that we always keep together would be history with map/geography and literature.
All of the kids know that NOT getting their work done means no weekend fun (Saturday can be a school day, too, if need be, and so can the week of Christmas!) and there have been a few around here who have had to school one subject through summer because they didn't quite manage to finish that Biology book.
We have a very flexible day, and most of my kids are finished with all their work before noon (then off to do some chores) I also begin school in early August to allow for extra vacation days as well as sick days and 'mental health days' for me & them too. We begin with two weeks of just Math and Grammar to ease into the year, and then move to full schedules. The middle to end of May are days designated for 'catching up' on anything needing to be finished, so those are either vacation days or half days depending on the child.
Our first year, I was constantly fretting that we weren't 'doing enough' and had a teacher friend review their half-year work to be certain. She said my kids did more in half a year than hers would manage all year! I quit worrying about it after that. I must say that I love home schooling and so do the kids.